Please help!

A home owner from Cheshire CT says:
The part number says c-9400-1 arm length is just over 8 inches. The window type is Anderson. Any direction you may have would be great. The number on the arm is 1521101 Brass plate underneath reads f-9400-8 with the letter B underneath
Thumbnail of the uploaded file named image.jpg
Thumbnail of the uploaded file named image.jpg
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Bob from SWISCO responded:

See either the 39-099 Andersen Awning Operator or the 39-331 E-Z Operator, depending on the attachment at the end of the arm. Look over both to see if one of these matches what you need. 

Anatomy of a casement window
Anatomy of a casement window
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