Adjustable rocker identification?!

First, I know next to nothing about small blocks, but....
Those could be 273 rockers with a spot face so that a lock nut COULD be used, maybe in place of worn out adjusters that can't be found. At least one set has had bushings installed.
Of course, they could be isky's (though iskys usually had his name on em) or Crane, or Sig Erson.
The adjusters with a screwdriver slot look like my maxwedge pieces, but I think the solid lifter 300s used them too. The big block adjustables used lock nuts.
if i were to make a bet.... Sig Erson.