WTK: Is this a good deal?

One of these (perhaps a 41 banner, don't recall exactly but it was a two-digit banner 41 or 42) appeared for sale in Bellevue Nebraska a couple months ago and I inspected it only to find it had a weird serial number way outside the known range. There is quite a bit of documentation around about these. Check out the serial number for correctness and inspect the parts and finish in detail to convince yourself it is correct.