No Rem 12 D&Td for scope mts from the factory as an off the shelf rifle.
On the high grades I wouldn't rule out a special order in a D or F grade floating around with some sort of factory fitted scope. But that's be a rarity and the collectors would gather around and argue all day anyway about wether it was 'right' or not.
Lots of these and other early 20th century 22s were after amrket D&Td for scope mounts, both side moun ts and top bases. The Weaver were especially popular once they hit the market post WW2,,,and you just had to have a 'scope of course.
Now I spend a lot of time plugging holes in old rifles from those scope mounts.
A Remington collector once brought me a GradeD, E & F Model 12 (Peerless, Expert & Premier) as well as a Model 16 semiauto in Grade F
All very rare hard to find rifles and all had been drilled and tapped for an assortment of top and side mounted scope mounts and blocks at sometime in their lives.
The D & E M12s & the F M16 had be buffed and blued as well to pretty them up. Lots of work but they all were brought back to original con dition including the wood.
Weaver, Black&Decker and Baldor have provided me with tons of work over the years.
The Remington 12 (and it's big brother Model25 pump in 25 & 32WCF) are overlooked for the Winchesters some. But they are coming up there in price.
I like the Stevens 29A and B models too. The B is factory D&T or grooved depending on when made,,the 29A is not,,otherwisew the same rifle.
The model29 is an earlier rifle and is different inside all together (pre-war) but very nice and similar to the even earlier M25.
Lots to choose from.