Martinez Coins San Diego in Chula Vista's Third Avenue Village buys and sells gold, silver, and rare coins from its storefront at 255 Third Avenue, operating as one node in a multi-location San Diego County coin-buying network with additional outposts in La Jolla, Clairemont, La Mesa, and El Cajon. The shop's gold-and-silver buying program targets the same walk-in seller market as Third Avenue precious-metals dealers and nearby jewelers including Roberto's Jewelry, giving sellers comparative pricing within the downtown district. Inventory for buyers includes American Eagle Gold and Silver Bullion, Walking Liberty issues, Morgan Silver Dollars, Peace Dollars, Kennedy half-dollars, and assorted foreign coinage. The downtown Third Avenue location sits within the walkable dining-and-retail strip that also hosts Manhattan Bar, anchoring a buyer-and-seller foot-traffic loop between the coin shop and the corridor's evening economy. Free verbal appraisals process on a walk-in basis, and the shop's mobile coin-buyer service dispatches to residential locations across San Diego County for estate-scale collections too large to transport.