It's interesting you say it was made in japan, as mine says on the tang:blt-2-drg,
Your knife is a model 1237. Nutoknives: you are close. The 1233 had a 4 inch blade and the 1237 had the 5 inch blade. Looks like a 1960-70s version. Made in Japan.
Hope this helps.
Best Regards,
Paul Tsujimoto
Sr Eng
Prod Dev and Qual
KA-BAR Knives
Thanks! I have more questions about this knife and another one I have, but I'll start a different thread so I don't hijack blt-2-drg's thread.loonybin,
If it says,"USA". It's made in the USA. They were made in both countries. Originally in the US and then moved to Japan and presently in Taiwan.
IIRC, the early models were Chrome plated Cro-Van., so you could be correct. They were then changed to 440A and then comparable steels overseas.