Its a 1917. The 1920 lacks the step down on the body. I think yours is more rare.
Thanks for the info that is what I thought it might be cant find a pic of one where the lanyard cut is in the wood like this one, I bought it quite sometime ago.
Great running trumpet, I like the delrin 45 model to hunt with since it is weatherproof and some may not like em but I really like the way that model 45 runs in the woods.