and for the suggestion CW (sorry, I don't know your name).
https://bid.robertedwardauctions.com...e?itemid=51961
Lot # 373: 1909-1911 T206 White Border Partial Set (379/524)
and buried in the small print near the bottom...
Eleven cards in this partial set have "Howe McCormick" ink stamps on the reverses.
Brian has been kind enough to send me a scan of the eleven cards for my records and none of them were ones I knew of before. Brings the total up to 47 cards with the stamp that I know exist, but aren't in my collection. Hoping the winner of the lot might be willing to work with me on getting these eleven back with the others.
Again, thanks to everyone on the board for all their help with my strange quest.
Ed