BeaconRay 173- A?

Interesting find, apparently was a 174-A originally and previous to me the guts were swapped to a 173 for one reason or another. SN on the tag reads 2N10MO.. this translates to 12VDC, 1958-59, Perm or Detachable mount, October, 1960? this presents the problem that the tag reads 174-A for stanchion mount and the 10 is not that option. Also the 0 at the end I would assume means 1960? not 58-59 that the N means. Regardless, neat light I might get a new badge for it since its no longer a 174.