Unknown Vendor Window Part

A home owner from Florida says:
Need replacements for old window cranks. House is old and nothing is standard. Can't identify manufacturer, although Swisco seems to be very close, if not it exactly. Crank base has the following part no engraved inside: PT NO 10-9231-LH-4.
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Bob from SWISCO responded:

Thanks for writing in. I'm afraid it's very difficult to say what awning operator you need without seeing the intact link arm, including the hole at the end. Is there an undamaged version of this operator that you can show us that still has the link arm intact? In the time being, I have listed several sets of operators that have a similar mounting hole pattern to yours. Again, I can't really narrow down which is what you need without seeing the link arm. I apologize for the inconvenience, and let us know what you find. 

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