Finding replacement crank for casement window

A handy person from Washington DC says:
April 8, 2021
Hi, I moved into an older house and the cranks are missing on my windows - I'd like to replace them if I can. Windows are likely from the 70's or 80's.

Here are the specs:

There's a notch in the gear, as well as a second gear at the base of the spline.
Both gears have 11 teeth.
I measured the base of the spline between the two sets of gears and it's about 5/16 of an inch. I had difficult measuring this so if that sounds off, that could be why.

Thanks for your help!
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Bob from SWISCO responded:
April 13, 2021

I believe this might be a Pella operator, in which case, see if our 39-109B matches what you need.
3/8" Handle for Pella
3/8" Handle for Pella
39-109B
$11.25
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