Posted By:
Tim NewcombHi Scot,
I think Todd and I in our article estimate the Gimbels' cards at about 5% of total M101-4s. That sounds low, but there are 18 backs in M101-4 alone, after all, most of them more like .1 to 2%. So at 5% Gimbels is among the more common backs, though nothing like as common as blank or Sporting News. (F&B is pretty common in M101-5 but scarce in M101-4.) Maybe you're right, maybe 35% premium is low. But M101 premium values are notoriously inconsistent from sale to sale, so it's hard to pin down a clear figure for any backs, even the blanks.
As far as the three types of Gimbel backs, it's even harder to estimate with much certitude-- the numbers seen are just so small.