Commercial reproduction of the WW2 era knife released in 1976 for the 200th anniversary of the USMC, this one is model 1217.
These parked versions were made from 1976-1991.
I would say yours is late 77 to mid '80's based on the very thin plastic spacers, and the longer grind on the clip than the later versions.
No later than 1991 though as yours is parkerized, after 91 blades are powdercoated.
Hope this helps.
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