John, thanks for sharing your opinion. Since the book does not differentiate between the two I would say the price would be more like whatever you can get, since the book does not make it exactly clear, although from the pictures it does certainly indicate the square tab with not hole. Also, I measured one that I have, the Pat. Pending, with the same markings as in the book, but with the rounded tabs and hole in the tab, and it measures 6 7/8 inches, just like the book says. Although on my ruler it said 7 inches, but what the hey.