Truth part 30866

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Bob from SWISCO responded:

Thanks for writing in. This number has indeed been associated with the 38-089 & 39-090 Dyad Operators. However, old product codes are seldom the most reliable way of identifying the right replacement. Compare your operator's dimensions for those listed for the 39-089 and 39-090, and let us know if you think these will work for you. 

A home owner from Drexel Hill PA says:
What is the current part number for this casement window crank mechanism?
Connecting a casement window operator to stud bracket
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