Tim Frazier has some nice M17's. He located a fine Deluxe that now sits in my gunsafe. I also have a "shooter" with a Lyman adjustable choke. Major difference between it and the M37 Ithaca is that the Ithaca has both top and bottom extractors whereas the M17 only has a bottom extractor. Ithaca planned to introduce a copy of the M17 in 1933 when Browning's patent expired but Pedersen had made some changes in the Browning design and those patents didn't expire until a few years later permitting Ithaca to run with the design with a few changes. M17s were made in any gauge you desired as long as it was 20 gauge.