The Registered Magnum was a made to order gun only...
Wasn’t it a custom among gunsmiths to make presentation models of the first ten or so, some elaborately engraved and otherwise tarted up for presidents and other prominent folk?
The first one went to J.Edgar Hoover (he liked to accessorize). Daniel Wesson liked presenting handguns to notable hunters and shooters. Several were presented to Ed McGivern the famous exhibition shooter. Most were purchased by persons who wanted the best and in many instances, needed it.