John,
I am a bit hazy on the exact dating and too lazy to look it up... But I believe the 3" chambering was not common until a few years later circa 1930 if memory serves. The .410 cartridge went through an evolution. There are early examples, Eley, of shells under 2". It never seemed to "take off" in England as a sporting round. While a few makers produced sxs guns for it in England, it was more popular as a handgun defensive round.
Once the tariffs fell, 1915, makers started to chamber for it here. It went through an evolution. So, a Crescent 410 with original 3" chambers would be dated a bit later. But of course, I could be very mistaken about the dating. I was hoping Rockdoc would chime in on this. He wrote some nice articles about the 410 a while back.
Utah, you can try
http://www.e-gunparts.com They might have something. Call them up to be sure.
Pete