I don't know if they have serial numbers or even the year made. I have a Monarch Royal that I purchased from a classified add. All it had on it was Monarch longbow, Royal and the Specs (64" 57#@28 ). I believe Ron's name (bowyer) was under the Leather Wrap.I imagine Monty did sign some of them, and I am pretty sure that I have seen Byron's name on an occasional Monarch bow that has been pictured on the internet.This is a poor picture but you can see where the name, under the wrap, is in the glare. The Monarch Royal is pictured next to an Aspen Vector by Byron.