Andersen casement window crank.

A quick learner says:
Numbers on the glass are 31-98.6 can you tell me which crank I need?
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Emily from SWISCO responded:

Hello!

The operator shown here looks like an older version of the 39-264. Take a look at the specifications below and see how they compare with your old assembly.

Let us know if you have any questions!

Dimensions for 39-264
Dimensions for 39-264

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