Sheldon will know this date for sure, from his research and book. But if I had to guess, I think it was 1972. Unlined lanyard holes ended that year, so I am guessing brass started right after that.
In 1973 yes, prior to that, not so much. Make sure it's a maker dyed sheath, not a user dyed sheath as that does make a difference. A maker dyed sheath will be black throughout; a user dyed sheath is typically done only on the outside surfaces. Hope that helps.
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