Old Pella operator replacement

A quick learner from USA says:
Operator for a nineteen-fifties Pella Window

operator and handle
Profile picture of Paul
Paul from SWISCO responded:
I'm not sure what to recommend. We will need to see the rest of the operator, not just the arm and handle. Can you show us a clear picture of the complete operator unit?
A quick learner from USA says:
I sent you a picture of the arm and a broken handle. This is the operator in place. Do I need to take it out in order for you to know what I need to replace this ?

Thank you for your time and expertise.
User submitted a photo of a window operator.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Thanks for getting back to us. I'm not sure if we will be able to replace this. The only operators that come to mind are our 39-385 and 39-386, but yours is very very old and I'm not sure how well these will install in your window, if at all. I am sorry we cannot offer a better replacement.
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