It can have a scope mounted on it and still be unmolested from it's factory originality.
It's just that the rear scope mount base would not be attached to the middle of the rear recv'r bridge as Wyo mentions.
The rear scope base was intended to be mounted using the same screw holes on the left-rear side of the recv'r that also were intended to be used for the aperture/'peep' sight mounting.
The base attached to the side and the structure of the base mount then placed the scope in the ring central over the rear recv;'r ring.
Many people found this to their disliking and simply had the rear bridge D&T's for a common scope block.
An aftermarket D&T'd rear bridge lessens value quite a bit on a M70.
The butt plate should be the checkered steel with 'widows peak' at the top IIRC. Special orders were of course available and a pad is a possible factory item.
But those available from the factory at the time as options don't sound anything like the description of whats on it now.
Bbl should be dated on the bottom up next to the recv'r.
Bbl Date is yr the bbl was made. Not the yr the bbl was assembled onto the recv'r.
So you can have a bbl with a yr date that is older, and sometimes a few yrs older, than the production date by ser# look-up of the rifle.
Bbl's sometimes sat around is storage waiting for production runs to be used on the assembly line.
Some were marked 'S' or 'Super' on the bottom as well on the S/Grade. But that as well seems to be an on again off again thing.
The bottom edge of the recoil lug should be marked with an 'S'
Jeweled bolt, bolt body ser#'d to the rifle. The bolt ser# done by hand scribing with an ElectroPencil. Sometimes it's very light but it's there on the bottom,,take the bolt out of the gun.
Bolt body should be 'jeweled'. Winchester did that rather heavily, deeply cut. As opposed to aftermarket jobs (and most fake upgrades) which are done nicely but the swirls are much, much lighter cut.
SuperGrade stock should have 'SuperGrade' detachable sling swivels.
These are QD but are a slightly smaller size than the look-alike QD swivels that winchester used on their other guns.
Also, the bases for these S/G swivels was a solid base held in the wood with 2 wood screws. No single shaft wood screw.
I think the only other Winchester to use these odd size QD swivels was the Mod 52 Sporter.
I think the SG used a Gold Bead front sight,,not the usual Silver bead of most other Winchester front sights. Redfield mfg(?)
This may have been something that came along after production started so ser# would be important to decide if orig or not.
So many nuance points in deciding originality on a M70 and a S/Grd in particular.
There's fake sets of the swivels, S/G marked floor plates, and all the other special parts needed to make your very own SG. Even bbls and stocks.
