I was given this rifle in 1973. It is new, never fired. In doing some research I found a picture of the rifle which had a brass plate on the stock saying "39 Century Ltd. 100 Marlin Years". Mine does not have this plate. On the top of the barrel it is engraved " Marlin 39 Century Ltd." I also have the Marlin 2 rifle Commerative Set brace of 1000. Models 336 and 39. they were originally purchased from a Marlin employee who said they were all serial # 75. Can anyone offer an opinion as to why my rifle is missing this plate and how it may effect the value. Also, I have searched the serial number on the 39 Century Limited and can not find one. Any thoughts as to where it is located? Thanks for your help.