casement window arm operator

A home owner from Iowa says:
I'm trying to identify an arm operator (photos enc.). The window is approx. 2 ft high by 3 ft wide with the crank on the right side. The window swings out from the bottom. The photos show most of the markings or numbers. I think it might be part no. 39-031 but would like you to verify.

User submitted photo of their window operator.
Profile picture of Tom
Tom from SWISCO responded:
Hi, Rick. I agree, the 39-031 and 39-032 appear to be our best matches, especially since the dimensions are the same.
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