Visited a local antique store this afternoon (the wife and daughters were out dress shopping!). This place sells stuff on consignment, and often their stamp material is a little overprice, for my liking. But I found these two postcards which caught my attention, and was able to wangle a deal.
Both sport very common US stamps, but were postmarked in Canada. The first canceled July 9, 1914 in Montreal (with a very nice commemorative cancel) has a 1¢ Washington with what appears to be perf 10, with one straight edge (booklet pane?) so I'm having trouble determining it's catalogue number (perf 10s did't come out until September of that year) The second card caught my attention because of the purple 8 cents due rubber stamp (two postage due stamps had been affixed below the address but have long since been removed - only some gum remains) next to the John Adams #806, was postmarked on September 8 1954 in what appears to be Dorion-Vaudreuil Quebec (now called Vaudreuil-Dorion) sent to Ohio.
Here's maybe a nice surprise for you James that you probably weren't thinking about when you picked up the first card but the slogan cancel for the "Cartier Centenary..." is listed in Coutts 2007 edition of "Slogan Postmarks of Canada" as cat. number C-525. It was produced on an International Postal Supply machine, was only used in Montreal and is listed with a cat. value of $20.00. I would take the cat. value with a small grain of salt but it does give an impression of how common it is based against lots and lots of other slogan cancels with values in the $3.00 to $4.00 range.
As far as a booklet single perf 10, double check to make sure but I think #424d, booklet pane of 6 I think came out in 1913.
Hey Rick, I think you've hit the nail where it hurts! 424d fits the puzzle perfectly. That number (which catalogues at $7.50 (2012) vs. .20¢ for the regular 424), the nice cancel and the improper usage of the stamp itself makes for a nice little package, I think. Thanks for the help.