If you have a rimfire spur trigger model tip up model,than you have a model 1 1/2 second model which was made from 1868-1875.If you have a centerfire model 1 1/2 then it was made from 1878-1892.You may also have a model 2(old army .32cal rimfire tip-up)which was made from 1861-1887.This is based on the serial number that you supplied,and a limited description of the firearm in question.