Re: Gibson SGs are the ****.
Judging from that being a pic of Les Paul, the side-to-side vibrato, and the weird pickguard, I'm guessing that those SGs are early prototypes. Either way the neck pickup was moved toward the bridge when the SG design changed to the full pickguard version in '66. All current SGs (except historics and '61 reissues) use the later design and neck pickup position.
Actually, the only SGs that share that pickup location are all the Norlin SGs from the '70s and the standards from the '80s (dunno about the '80s customs, I've never played one).
The '61 SG (as well as all reissues) had the neck pickup on the same position as the '66 SG and later full 'guard standards. You can tell by the small plastic cover between the fretboard and the pickup.
For example, look at the white standard a few posts up, no plastic cover. Iit's an '80s model by the lack of a selector switch on the traditional spot.
I'm guessing Gibson decided to move the neck pickup towards the bridge because of the box joint used on the early SG necks. Having the neck pup on the traditional Les Paul spot would have taken away a great chunk of the neck joint, making the guitar even more fragile. The neck joint changed around '66 (when the full 'guard was added) to a stronger and longer tenon and mortise joint. They kept the same pickup location until 1970 when they figured they could move the pickup, or rather the whole neck/fretboard, to have the neck pickup on the traditional Les Paul spot without compromising the neck joint integrity.
Those SG/Les Pauls on the Les and Mary photo above are really odd, most likely prototypes. The neck/fretboard looks, to me, like the ones on the '70s SG, not like the ones on the '61-'65/early '66 small 'guard SGs. Anyway, hard to tell from a photo.