21mm Sub calibre round for the training version of the 66mm HEAT rocket. It went out of service in the early 1990's. So not a Rifle Grenade, Fletchette or WW1. Range scrap I'm afraid.
Regards,
R
Oh and most of the ww1 flechette that have been appearing on the market the last couple of years are modern copies, I know I have seen where they were made!
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