Just purchased an older 39a with a letter L in the serial number, 1953 era, correct? The bore is clean, stock has some minor nicks, blueing is nice with some minor blemishes with no real significant wear. It has open sites that look original and is also drilled and tapped for scope mount. I picked it up from a friend for $325 who inherited it from his dad who might have purchased it new. How do I determine if it is a "golden" model and value?