There must have been some 24 gauge guns around, at least in Canada. CIL wouldn't have stocked them commercially if there wasn't a market. The box says "made expressly for CIL", so they were likely imported from Britain. Canadian Industries Limited exported to the U.S. quite a bit in those days, so perhaps they filled the need there. This is from my father's collection, and the box may still be full if I remember right. I would have to do some digging to put a time frame on when or if they were importing the 24s. By the way Bill, I saw some CIL "Canuck" boxes the other day that you might find interesting. 28 gauge slugs and buckshot. I guess some people with 28 gauges were one gun men.