I put this one hold hoping it was what they said but had a bunch of what it really was. Marked as a SHTLE Mark 3 in 303. I looked it over quickly and liked the price so I put it on hold. As I was handing it over I saw 410 RFI 1931 on the rear band. Fast forward a few weeks and sure enough as soon as I looked at the barrel I knew it was one of the factory converted single shot 410 models. Condition is good so no complaints and I brought it home. It is a 1924 production that was converted in 1931 so no combat pedigree. But story on these is that they were police riot guns so still a great history. Thus far no import mark but I'm sure it's there somewhere.