Don, you might be right about the incorrect measurement. I made some "quick" checks for relative sizing, and this bow appears that it might actually be a 60"-er. But, then, there is the problem of the serial number. The DB prefix corresponds to 64" bows, but this one does not seem to be a 64" bow (and, that makes the 56" "length" harder to understand). However, if the serial number had originally been BB664, and the gold ink had faded badly so that the lead B looked like a D, then that would explain the incorrect serial number for a 60" bow.
Finally, the serial number is written on the "wrong side" of the bow (on the coin side) - I have never seen a RH 59 Kodiak with the writing on the coin side. So, if the refinish & writing were done by someone who did not understand the usual location to write the info, it may be that same someone did not realize how to measure the length of the bow, so he measured on a straight line from tip-to-tip.
Ah, mysteries are such fun!
Ray