Octagon unknown manufacturer window

A quick learner from Palisade, CO says:
This operator goes to a small octagon shaped stained glass window about 16" across.

I am having no luck finding this operator and am hoping you can identify it. Upon closer inspection the arm is actually 6" center to center even though my photo makes it look like 6 1/4".

Thanks in advance for your efforts
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Bob from SWISCO responded:

Thanks for posting. I am afraid we do not carry this operator with an arm that short. Our closest is the 39-020, which has a 9" arm that I doubt is going to work with your window. A local hardware store familiar with octagon windows used in your area may be your best bet. I am sorry we cannot be of more help. 

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