Tikka,
I just got back from my LGS and the Marlin is still there. The serial number starts with the letter "K", so I checked you reference sheet, and it looks like it was made in 1953, correct me if I'm wrong. The gun does not have checkering, so that checks out. There are some handling marks on the stock and it's marked Marlin 39a. Is $600 a buy price or a decent price? I have some pictures I could email you if you want to look at them. Thanks!