Picked up the Smith catalog from a gunshop this weekend. IN the classic's section was a new model 15. But. It has an underlug. Looks like a 19. Check it out.

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S&W Accumulator

I saw that and the shrouded ejector rod was the first thing I noticed. How can it be a 'classic' Model 15 with a shrouded ejector rod?

Just checked the on-line catalog and could not find any mention of a Model 15, under lug or not.
They do show both a Model 17 and 18, tho.