In looking at the Wagner Ware Sidney -0- pans, they all have a number followed by a letter near the handle. I assume this is a makers mark of some kind? Can someone in the know fill me in on the significance of this number? For instance I have seen a 1056H, 1056E, 1056V, 1056Z. Does this number affect the value or collect ability of the pan? Thanks for helping out the new guy.