I've not heard of one, but that doesn't mean anything. I don't have the standard catalog handy, so I can't say for sure. I have a 3" model 10 from the late 60's, and those are relatively rare. Three and a half would be very much so. Compare the barrel roll marks with a 4" version of the same era - if they match, it's possible the barrel has been cut down from 4".
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