This action is for an injunction to restrain the seller of a business from breaching his covenant not to compete with the purchaser. Its venue is the county in which plaintiffs or defendant (or any of them) resided at its commencement, G.S. 1-81. For the purpose of suing and being sued, the residence of a domestic corporation (formed after 1 July 1957 and having a registered office) is the county in which the registered office of the corporation is located. G.S. 1-79. A registered office may be, but need not be, the same as the corporation’s place of business. G.S. 55-13. Defendant’s first assignment of error is to Judge Armstrong’s order denying defendant’s motion for a change of venue. This order recites that the registered office of both plaintiffs is in Guilford County. Defendant does not challenge this finding. The action therefore was properly brought and heard in Guilford County. Defendant’s first assignment of error is not sustained.
Assignments of error 2-7, based upon corresponding exceptions, are to the failure of the court to construe the written contract between plaintiffs and defendant in accordance with defendant’s contentions. Although each purports to challenge a specific finding of fact, assignments 2-7, as well as defendant’s remaining assignments 8-12, attack the court’s conclusions of law. They raise only the question whether the facts found support the judgment, or whether error of law appears on the face of the record. 1 Strong, N. C. Index, Appeal and Error § 21 (1957).
The appeal poses this question: Is defendant’s covenant, made at the time he sold his retail jewelry business to plaintiffs, not to engage in that business in the Town of Morganton and within a radius of 10 miles of its city limits for a period of 10 years from the date of sale, a valid and enforceable contract?
It is the rule today that when one sells a trade or business and, as an incident of the sale, covenants not to engage in the same business in competition with the purchaser, the covenant is valid and enforceable (1) if it is reasonably necessary to protect the legitimate interest of the purchaser; (2) if it is reasonable with respect to both time and territory; and (3) if it does not interfere with the interest *663of the public. G.S. 75-4; G.S. 75-5 (d); Buick Co. v. Motors Corp., 254 N.C. 117, 126, 118 S.E. 2d 559, 566; Sineath v. Katzis, 218 N.C. 740, 12 S.E. 2d 671; Sea Food Co. v. Way, 169 N.C. 679, 86 S.E. 603; Shute v. Heath, 131 N.C. 281, 42 S.E. 704; King v. Fountain, 126 N.C. 196, 35 S.E. 427; Kramer v. Old, 119 N.C. 1, 25 S.E. 813; Cowan v. Fairbrother, 118 N.C. 406, 24 S.E. 212. Cf. the tests which determine the validity of an employee’s covenant not to compete with his employer at the termination of their relationship. Buick Co. v. Motors Corp., supra; Welcome Wagon, Inc. v. Pender, 255 N.C. 244, 120 S.E. 2d 739; Kadis v. Britt, 224 N.C. 154, 29 S.E. 2d 543, 152 A.L.R. 405; Beam v. Rutledge, 217 N.C. 670, 9 S.E. 2d 476; 17 C.J.S., Contracts § 247 (1963).
The modern rule permitting the sale of good will recognizes that one who, by his skill and industry, builds up a business, acquires a property right in the good will of his patrons and that this property is not marketable “unless the owner is at liberty to sell his right of competition to the full extent of the field from which he derives his profit and for a reasonable length of time. . . . Where the contract is between individuals or between private corporations, which do not belong to the gwasi-public class, there is no reason why the general rule that the seller should not be allowed to fix the time for the operation of the restriction so as to command the highest market price for the property he disposes of should apply.” Kramer v. Old, supra at 8-9, 25 S.E. at 813-14. Accord, Beam v. Rutledge, supra; Sea Food Co. v. Way, supra; Wooten v. Harris, 153 N.C. 43, 68 S.E. 898. See Breckenridge, Restraint of Trade in North Carolina, 7 N. C. L. Rev. 249 (1929).
The reasonableness of a restraining covenant is a matter of law for the court to decide. Shute v. Heath, supra; 7 N. C. L. Rev. 249, 256. In each instance, the reasonableness of the restraint depends upon the circumstances of the particular case. Shute v. Shute, 176 N.C. 462, 97 S.E. 392; Sea Food Co. v. Way, supra; King v. Fountain, supra; 17 C.J.S., Contracts § 246 (1963). “A contract, for instance, for a valid consideration not to engage in the manufacture and sale of firearms in general use would be allowed to cover a larger extent of territory than would a contract not to engagé in the manufacture of timber or the ginning of cotton.” Shute v. Heath, supra at 282, 42 S.E. at 704. For comprehensive annotations covering the reasonableness of territorial and time limitations, see respectively 46 A.L.R. 2d 119 (1956) and 45 A.L.R. 2d 77 (1956).
In the cases cited below, this Court has upheld covenants not to compete which accompanied the sale of a trade or business and contained limitations of ten, fifteen, and twenty years, as well as limitations for the life of one of the parties:
*664 Baumgarten v. Broadway, 77 N.C. 8 (photographic gallery; no competition within city for 10 years); Baker v. Cordon, 86 N.C. 116 (drugstore; no competition in town while purchaser operated business); Cowan v. Fairbrother, 118 N.C. 406, 24 S.E. 212 (newspapers; no competition within State for 10 years); Kramer v. Old, 119 N.C. 1, 25 S.E. 813 (milling business; no competition in vicinity for lives of sellers); Disosway v. Edwards, 134 N.C. 254, 46 S.E. 501 (saloon; no competition in the city for 20 years); Anders v. Gardner, 151 N.C. 604, 66 S.E. 665 (livery business; no competition in city during life of seller); Wooten v. Harris, 153 N.C. 43, 68 S.E. 898 (mercantile business; no competition in town or environs during buyer's life); Faust v. Rohr, 166 N.C. 187, 81 S.E. 1096 (barber shop; no competition in town while purchaser operated business); Sea Food Co. v. Way, 169 N.C. 679, 86 S.E. 603 (fish dealership; no competition for 10 years within 100 miles of city); Sineath v. Katzis, 218 N.C. 740, 12 S.E. 2d 810 (drycleaning plant; no competition for 15 years in county); Thompson v. Turner, 245 N.C. 478, 96 S.E. 2d 263 (wholesale coffee, tea, and specialty business; no competition for life in seller’s territory). For the cases from other jurisdictions involving limitations of ten years or more, see Annot: Sale — Covenant as to Competition — Time, 45 A.L.R. 2d 77, 238-291 (1956). See also 7 N. C. L. Rev. 248, 256 (1929); 38 N. C. L. Rev. 395, 396 (1960).
In this case, defendant sold a jewelry store which was a sole proprietorship. A jeweler who has attained the confidence of the public in his integrity and knowledge of gemmology imparts a peculiar value to the good will of his business, and he will take it with him when he leaves the business. The average person is unable to evaluate a precious stone and to judge its genuineness or perfection. When he makes a purchase, he will seek a jeweler of good repute — just as he would in selecting a doctor or a lawyer. As Avery, J., said in Cowan v. Fairbrother, supra at 411-12, 24 S.E. at 213: “Neither an editor, a lawyer or a physician can transfer to another his style, his learning or his manners. Either, however, can add to the chances of success and profit of another who embarks in the same business, in the same field, by withdrawing as a competitor. . . . The one sells his prospective patronage and the other buys the right to compete with all others for it and to be protected against competition from his vendor.”
The purchaser of a retail jewelry business, operated by an individual, will usually feel that he cannot afford to pay full value for it unless he can obtain from the jeweler who sells it an enforceable restriction from competition until he can build his own good will. It takes time for any newcomer to acquire the confidence of the towns*665people. Individuals and businessmen alike must demonstrate competency, responsibility, and integrity for an appreciable length of time before they acquire general reputations for these attributes. We cannot say that ten years is more time than The Jewel Box needs to be protected from defendant’s competition in a small town where individual businessmen are widely and personally known. Although a valid covenant not to compete must be reasonable as to both time and area, these two requirements are not independent and unrelated aspects of the restraint. Each must be considered in determining the reasonableness of the other. Furthermore, neither is conclusive of the validity of the covenant, but both are important factors in settling that question. See Note, 38 N. C. L. Rev. 395 (1960). In situations such as the one we now consider, a longer period of time is justified where the area in which competition is prohibited is relatively small. Certainly an area which encompasses only Morganton and the locality within a radius of 10 miles of its city limits is not unduly restrictive territorially. Furthermore, with four or five jewelry stores in the trading area, the elimination of defendant’s competition cannot be deemed detrimental to the public interest.
Defendant’s contention that plaintiffs purchased the good will of Morrow’s Jewelry for a period of only six months; that only $25.00 was paid for it; and that there was no consideration for his covenant not to compete cannot be sustained. Considering the contract as a whole, the only reasonable and fair construction is that the six months’ limitation applied only to plaintiffs’ right to use the name Morrow’s Jewelers. Along with the business of Morrow’s Jewelers, however, defendant sold its good will. The covenant not to compete carried the good will. “Where a person sells a business and in connection therewith agrees not to engage in the same business in the same place, the obvious intention is to sell the good will of the business.” 24 Am. Jur. Good Will § 13 (1939). Such a contract requires a consideration, “but the consideration for the sale of good will and the withdrawal from competition may be found in the general consideration for the sale of the business.” Id., § 15. Accord, Kramer v. Old, supra. In September 1963, defendant wanted to dispose of his business. It is clear that he could not have sold it for the price he received — if he could have sold it at all — without his covenant not to compete. It was, therefore, a material part of the consideration moving from defendant to his vendee. Having collected the purchase price, good faith and business justice now require him to keep his bargain. The covenant does not prohibit him from selling any merchandise except jewelry items within the prescribed territory; elsewhere, of course, he is entirely unrestricted.
*666In our opinion, the parties’ allocation of $25.00 of the purchase price to good will is not pertinent to the questions posed by this appeal. Defendant makes no contention that the contract of sale lacked a valuable consideration. A contract in restraint of trade, like any other contract, must be supported by a consideration, but, unless the contract be a fraud upon the party sought to be restrained or nudum factum, courts ordinarily will not inquire into the adequacy of the consideration. “It is sufficient that the contract shows on its face a legal and valuable consideration; but whether it is adequate or inadequate to the restraint imposed must be determined by the parties themselves upon their own view of all the circumstances attending the particular transaction.” 36 Am. Jur., Monopolies, Combinations, Etc. § 56 (1941).
The judgment of the lower court is