Posted By:
Tim NewcombHi Barry,
Bob M. and I are "working" on a long-awaited (by us, anyway) article on M116 which I hope will explain fully the anomalous 300 Subjects cards (like Collins). Suffice to say for now that they are very scarce compared to the other backs of those players, despite not being in the "high series". And all the high-series cards are vastly more scarce than the lower ones. Any other questions, contact me directly 
Best wishes,
Tim