Mark, I'm sure that's the very one. I long since gave away my own copy of Mister Rifleman to a friend's son and couldn't remember whether it had been done by Baker or Humphreys (sp?), but it was indeed a stunner. AAMOF I never saw another one even close to its class until I saw my first SDH low wall.
There's an already-blueprinted flat-side round-top low wall SST action hanging on my shop wall right now, Cody letter says it was shipped as a 22RF with #2 barrel and Swiss buttplate in the early 1890s. It's awaiting a tuit....
Regards, Joe