Villager, MIJvintage anyone. I was looking at the backs of my 81' Greco Super power pick ups, Chambered, sycamore top. I always assumed that there U-1000 but, The first digit is a 5, the # is 511111. as opposed to a 1 or 2 for u-2000. They both measure almost dead nuts at 8k or 7.99k. Anyone, Have a clue as to what they are.