I found this old model Ruger Single Six. It's in great shape. Varnished walnut stocks and steel ejector rod housing. I'd rate the blue and frame ionization at 99%. XR-3 Frame. Looks like it was shot very little if at all.
Attached FileIt came with a .22 Magnum cylinder numbered to the revolver. It also had the transfer-bar upgrade.
The serial places it within that 1962 - 1969 gap.
Some things were not making sense to me so I called Ruger about it.
The guy I talked to there said it was made in 1962. I asked if the .22 mag cylinder was provided when the gun was sold and he said no, just .22 LR. He figured it must have been special ordered/fitted when the revolver was returned for the transfer-bar service.
What is unusual (or maybe not) is that the .22 Magnum cylinder is not marked as such, It's only marked with the last three digits of the serial. The numbers are stamped and not EPed like the later ones.
For all I know that might all be normal.