Hello there. Interesting. I have an exact twin to that one (complete with stamp). I can tell you that it is definately of a higher quality than a lot of the "bring-backs" from the 70's - I also agree with your date. And I believe the blade is tempered. I've always thought it was for krabi krabong practice. But I've always wondered why the stamp was in english if that was the case.
Shawn
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