Left hand casement

A quick learner from Vancovuer says:
The teeth on the arm have worn away. Looking to find replacement

Thank you in advance for your help identifying it
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Tom from SWISCO responded:

Hello! Your operator is very old and likely not made anymore. However, we do sell the 39-001 and 39-002 . These operators may just be usable as substitutes, but look them over and let me know what you think.

Dimensions for 39-001
Dimensions for 39-001
Anatomy of a casement window
Anatomy of a casement window
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