Help ID flash hiders

First great to be back looking at AK stuff. Second if I’ve posted in the wrong forum and maybe should be general discussion please let me know.

I found these flash hiders in my piles of parts. They would have come with all the other stuff I bought many years ago. They would have been acquired sometime in late 80’s to late 90’s. Most everything I’ve ever had is surplus import stuff but I don’t know where these came from. Threads are normal AK left hand.
Thanks for any help.
Alan