Someone here on the board once sent me a list of various names the Co used, with dates for each I believe. I tucked it away for safe keeping, now if I could just remember where!! What is the exact Co Logo on your gun. Mine is hammerless with SN 4230 & from the info I had it would date in the 2nd half of the 1890's. Have no idea if they were all serial #'d in the same sequence or not. I figured you had probably inadvertenly stuck that Y in, an easy mistake, as seems it should be there, but wanted to be sure.