Anyone remember what this was for.

one more pic

Looks just like the tripod for my old Bushnell spotting scope from the 70's. That help?
C.G.B.

Could be but my bushnell spotter has a 1/4x20 and it's green.

That's exactly what it is. I have one I used the other day.

It'll go on arbay for $10 to cover postage