when you say "refurbish" ,meaning, the finish or the overall working, function of the the firearm??? a decent ,closeup picture will tell us a lot as to the finish, but would have to use, feed,fire and function so see how it performs....... aside form the fact is it a Mark I ( the target model or the RST standard auto?)the MORE "original" any gun is, the more it is worth, rarity and packaging, serial number ranges, etc have the "value" or "interest"....there was an original early 1960s RTS-4 in its original box, and all very nice shape, guy next to me bought it for $300.........we've seen them sell for $450 the SAME "mint" package, same as the Mark I T-512, I sold at the holidays in the box for $450....so depends on what YOU want....if its "something" ( familyheirloom??) then worth saving and keeping, if to speculate, then you will putting time and money in something that is quite common, run of the mill?? they did make LOTS and lots of them since 1949 , until the Mark II came out in 1982..............