Need help figuring out mount for OPTEX x1.4 adapter-Canon FD to ????

I sure hope someone can help me with this-been driving me crazy for years literally!!

I have an OPTEX UK adapter/converter says IRIS+1 Stop and I know it fits into a larger CANON FD mount lens-such as a 300mm f2.8 etc.
optex.jpgcanonedn.jpg

I cannot find what camera mount it fits. The silver side -2nd pic is the CANON FD MALE END-
It is not a still camera mount. I assume a movie-type mount? PL?
The end in question-the OPTEX SIDE LEFT ABOVE has 3 flanges.

THANK YOU for looking and there is a reward for the person who can help me :laugh:
 
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