[Gary Fuller]

I recently found my first Parker Dollar Grade SXS. I have attached a few pics with all the letters and numbers I could find. I know the serial# is 3684, manufacture date of 1874. The letter/number GF28 is on the forpiece and receiver and barrel. Also an S with a star underneath on receiver. There is a light stamp of the word Belgium on the barrel. A circle with E, L, G, with a star underneath the letters. The number 17.4 on the barrel, plus a few other letters and numbers. The words laminated barrel on the barrel. Can anyone help identify what these number/letters mean. I'm also wondering if there would be parts for this gun, a firing pin, and maybe the piece that keeps the trigger cocked. Thanks Gary