This pawn store can conduct business in English. Accept Cash. Pawn loan is a huge part of Vallejo Coin Exchange business, as well as jewelry repair, buy, sell and trade. The most favorite things to buy and sell in Vallejo Coin Exchange are: diamond rings and other jewelry, luxury and high-end watches, TV's, home theatres, iPhones, iPads, Macbooks, car audio, top brand tools like Hilti, Makita, Bosch, work radios, video game consoles, musical instruments and equipment, stage light, sport stuff, hunting, fishing and camping equipment.