replacement single arm operator for casement window

A handy person from Spillville, Iowa says:
The window was originally purchased in 1987. The brand was Crestline.

Markings on the piece that are barely visible are what appears to be a house and the word TRUTH.

The arm is 9 1/2 inches long, measured from the pin on the left end to the center of the pivot in the center of the geared portion of the arm.
Thumbnail of the uploaded file named crestline truth operator
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Emily from SWISCO responded:

Thanks for reaching out to us! Our 39-027E comes to mind. The arm is 9-1/2" when measured from the center of the gear to the center of the wheel. Take a look and see if the specifications match what you're searching for.

Dimensions for 39-027e
Dimensions for 39-027e

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