Q: I inherited a small antique wall clock a few years ago. The case is wood and the clock works well as long as I wind it every five or six days. The pendulum swings inside a small extension of the case that’s covered with plain curved glass. The only mark I can find, “Heiss,” is on the clock face. Can you tell me something about the maker and the clock’s value?

A: A clockmaker named James Heiss was working in Philadelphia in the 1860s and may have made your clock. If it’s that old and in good condition, your clock could sell for several hundred dollars.