Your comment about the Nylon 66 just got me thinking about the 2 rifles I have from my dad’s collection. A GR8 and a Nylon 66 Mohawk. I think a 1 inch tube would be out of place on those rifles.You are going to get the Walmart types, like that Barska above, or you will spend $200+ on some vintage Redfield or Weaver B model.
Why 3/4 inch? There are decent 1” tubes with 32 mm bells that aren’t too much for the gun. Leupold makes a $300 28 mm bell scope, 1” tube.
Those claw mounts are called “tip-off” rings, or 3/8 inch dovetail rings. Some people just say “dovetail” which just confuses everyone.
My last two scopes were Simmons Pro Target Rimfires, 2-7x32 for $26. Far better scope than the $20 20mm scopes. But they are target reticles, not the fine crosshairs type.
I had a Marlin model 60 with a 2x7 "TV" view with a duplex reticle. I can not remember who manufactured it, just that it was marketed with "TV". I would like to find a couple of those.