Clayton,
I purchased a Pre-64 barreled action in 270 WCF, circa 1947 that had no collectors value whatsoever, other than it was an all parts matching original with bolt and barrel being a matched pair, or at least that was how it was marketed, and I'm not sophisticated or knowledgeable to tell the difference.... I guess also the fact that it has the cloverleaf rear tang, and the transitional style, 3-position safety gave it some additional value....I don't know, and really don't care. I bought it on a whim with the idea that it would make a neat project gun, and so I sent it to Wayne Jacobson with American Hunting Rifles where it is currently being reworked, restocked, and re-barreled/chambered in the caliber 9.3x62....
That doesn't really matter, but to your question, I don't remember that bolt specifically having anything printed on the handle flat, not that it didn't, but I just don't remember it. I'm pretty sure it did have the serial number scribed on the underside that indicated the same serial number as the action, not that that couldn't have been falsified as rookhawk laid out, but beyond the fraud, I figured any headspace issue will have been sorted out by Wayne during the re-barrel.
As an aside, I did purchase a whole bunch of spare parts for the Pre-64 action on EBay to have in case something broke, etc., and I do have a spare bolt body from a circa 1957 action. I just looked at the underside of the bolt handle flat you described, and there is a stamped "R" there. I have no idea what that means, but it's there......The picture below is of the area off the 1957 bolt handle.....
Also, for those out there that own Pre-64, Winchester Model 70's I purchased a book on eBay (the only place I could find it) that has hand-drawn pictures and descriptions that were approved by Olin Corp over 3 decades ago as a re-print of a manual used by Winchester technicians for take-down and assembly of the original Pre-64 Winchester Model 70's. It was supposedly originally drafted in 1957? Anyway, the manual is very useful, and I used it successfully to completely disassemble my Pre-64 barreled action down to bare components so that I could thoroughly clean and lubricate all the parts. Many of the parts like the ejector, bolt stop, springs, etc. were in need of a good cleaning as they had almost 70 years of dirt, grime, and surface rust that had accumulated. This manual made the disassembly and re-assembly very easy.
I'm not sure if I'm violating any posting rules for the forum, and if so, I completely apologize, but if not, I'll provide the link via eBay for the manual as it's a great resource for those of you with Pre-64s, if for nothing else than knowing how the rifle action is put together.
http://www.ebay.com/itm/winchester-...432709?hash=item1a00caaec5:g:EUoAAOSwrklVaEVt
I'll see if I can do more research as to what the "R" stamped on the underside of the bolt handle flat means....