Thorn window cranks

A quick learner from Steubenville Oh says:
No numbers appears to be an 8-9" arm. I'm not sure where you measure from.
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Tom from SWISCO responded:

This is one old operator. I don't think they've made these in decades. Of all the operators in our catalog, our best bet is probably going to be the 39-001 and 39-002. Yours is old enough that I can't be 100% sure they'll work, though. Look them over and see what you think.

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