Welcome.
In person, does your stamp look similar to this one?

This scan is a stamp that dates from 1894. In the Scott catalogue, it is given the number France-Offices in China #6.
This scan is from an item for sale now on bidstart (not mine), and the price is 75 cents. Doesn't mean it is not a neat stamp. Old does not necessarily mean valuable when it comes to stamps.
Condition does mean a lot, so a collector would bypass your example in favor of one that is not damaged. Doesn't mean you have to, though. Who knows? Maybe you'll get hooked.