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The owner of this reel must have been darn proud of it as he put a lot of effort into replacing the crank on his Orvis.
This is not a modified crank from another reel, it is scratch made. Note the crank is threaded and the locking nut is countersunk so the spool shaft does not protrude, and is not recessed. Nice attention to detail.
So well done, I don't think I'll try to find an original to replace it.
If a fisherman looses a handle or other part of his reel, he's going to do something because he wants to go fishing. Also if he didn't like the vibration of an unbalanced handle, he's going to do something because he wants to go fishing. This is good example of American ingenuity.