Very nice finds. IIRC, you have a few 8's now. There are those of us who aspire to one day have an 8 incher, those that own 1 or 2 eights, and then a small group lucky people who have 5+ eight inchers. (Then of course there is Demoman, he is his own grouping)
Anyway your 2 Parkers are different models. The 60x is a Superior first gen. The 2 digits followed by an X were the stationary models (29X, 39X, 60X...etc). The 3 digit followed by an X were the swivel base (229X, 239X, 260X...etc). Your number 60 looks look an Eclipse, possible precursor to the 100 and 200 series Eclipse vises.
Eclipses were great vises and could always be recognized from the 45 degree squiggly line going down to the base (when Union took over this became a straight 45 degree line). On your first pic you see it just left of the Coke bottle, just around the top of the Coke label.
Superior were Parkers extra heavy duty vise, the shoulder on the static goes out further, then a straight vertical line without the squiggly design.
On your first pic you can see the jaw tower slopes out further and the whole static is just more robust. Even the dynamic has more "meat" around the jaw tower. Anywhere they could add more heft and strength, Parker did so on the Superior.
I show listings of 248 pounds for the 60 and 265 pounds for the 60X. Superior are not as common as Eclipses; anyone who has owned both usually comment on the extra heft of the Superior vises. I think GmanBart had commented on his 4" Superior weighing as much as most of his 5 inchers...or something of the sort. Joe Striper also made comment on how he loved his Superiors.
Anyway, you have 2 great vises sir, congrats