Hi Ted,
Based on the SGC pop report and based on the following Mastro auction lot description the McQuillan Cycle 460 does exist:
http://www.legendaryauctions.com/Lot...px?lotid=76916
The SGC pop report lists 2 Cycles (50 & 60) for McQuillan, but doesn't provide a pose. It does list the cards as 1911 though. The only other McQuillan card in the set is the 150/350 series McQuillan (Ball in Hand) and this card cannot be found with a Cycle back. Thus, the cards in the pop report have to be Cycle 460's.
In addition, the Mastro lot specifically lists the McQuillan (with bat) as an SGC 50 with a Cycle back. This matches exactly with one of the entries the pop report.
PS - If someone on the board owns it I would be happy to buy it for my Cycle 460 subset.
Thanks,
Jerry