Looks like an old Kantpinch tab... I don't remember if that name is the make, or if it's the model. I shot those exclusively since the 80's, but came across a different cheap tab (can't remember the name) with a felt spacer that I like more. My dad (who is now in heaven) ran an archery shop in the 70s and sold those. When he closed it down, he kept much of his inventory, and we literally had a lifetime supply of these tabs. If I remember correctly, there is still a huge box of new-in-the-package tabs like this -- all left-handed -- in dad's garage!