Thanks Pete, Jim and Tom for your comments.
Thought I'd show you something I just discovered.
The two pistols have matching serial numbers.
My Daddy always subscribed to American Rifleman.
I'm wondering if Colt ran an ad in the magazine showing the two commemorative revolvers. And you could order one. Or you could order the other. Or you could order both. And as an incentive to get the both of them they would send you a pair with matched SNs.
Just speculating. I certainly don't know. But maybe something like that.
Regardless, it was a cool thing for me to just discover (had not noticed that before).