Maybe a model 68 or earlier? I think from the late 70's to very early 80's?
The levers, if original to the calipers, do give away that it's one of their older models that used the flat top shaped hoods. The compact dimensions of the calipers (pivot bolt to brake pad distance) do hint that these were meant for sport/racing frames which can give them a bit more value, than "ordinary", "cooking" brakesets. Otherwise, in used, VGC, but without hoods, I'd maybe pay a max of 60 bucks (mostly because they look quite rudimentary in design)........If I needed it bad for a project. If you get the new hoods to go with them, you should be able to bump up your asking price (by close to the price of the new hoods) and sell them much quicker.