Now I know why my ears were burning! 
I do know that call, infact the Olt T-20 was the first call I ever tried in the field, back in about 1969 or there abouts?
The T-20 has been made with and without the "world logo" you see on the pic Bob posted. It also came with a black stopper and brown body with and with out the "world logo" I also have a complete black T-20 and another in camo. So that makes six variations that I know about, and maybe more will show up?
There are probably more T-20's around than any other predator call made simply because Olt had such a large distribution area, and everyone that had a box of olt duck calls on their counter also had a box of olt crow calls and a box of T-20's.
hope this helps,
al
