After they are fitted to the frame all S&W hand ejector side plates and yokes are marked with the frame's assembly number. If 600 is on the left side of the grip frame then that is the original yoke.
I'm not claiming to know for sure but I can not add another vote for this explanation.
Quote:
Originally Posted by saemetric
Possibly the yoke was bent from flipping open the cylinder and wouldn't close properly so the frame was filed to bring the yoke further inward.
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The only portion of the yoke that is easily bent is the thin tube that the cylinder slips onto. If its yoke had S&W's normal close fit to the frame when it left S&W then filing there would not move the yoke significantly closer in.
My vote or actually my guess goes to an owner beat on that edge then filed off metal that he had moved into the yoke cut out obstructing the yoke. That makes the question why would someone beat on that edge?