Please identify the crank if possible

A handy person from Des Plains Il says:
To either side of the handle and on top are flat head screws that are not very apparent. I do not know if this is enough to let you Identify the crank replacement. Please let me know.
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Tom from SWISCO responded:
Thanks for posting. This looks like either our 39-389 or 39-390. Check them out and see if either would work.
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