Looking at the knives tells me you know better than to "clean them up". The #12 Bowie was introduced in 1953 and the wide top stone pocket was replaced by the narrower top around that time. My guess is that even with slower moving models like the Bowies, the older style sheaths that were in the bin would have been used by the end of 1954. The heft of the lugged hilt seems a little on the light side for that era but is probably correct. The Model #3 shealth, pin, choil and spacer stock place it perhaps a few years later but not by much. This is based on what I can see and you need to keep in mind that there are things that I can't see in the pics that could change what I think of the date. Seeing the stones would also help as they changed during this time frame.

Valuable? Very, but I suspect you knew that also. Two very desirable knives.

Dick, what's a Centenial Model? I don't think I've ever heard of that one.

Bob