made in 1900 according to the serial number,
does it lock up tight? If you intend to shoot it, any old gun should be checked out by someone who knows what he is doing ( not just the guy at the local gun shop).
If the barrels are good - and the wood is sound, get some short shells, at that age , the chambers are likely not 2 3/4, unless they where lengthened when that trap pad was added.
http://www.rstshells.com/ is a great source for shells