Thanks for the backup and supporting links Mackaydon. Like I said, I have my doubts and I always believed that the card cheater is someones imagination. Like I said, these are cuff holders and nothing more. Im not saying that someone may have somehow used a cuff holder to hide a card. I suppose its possible. And like I said, these were sold by Sears Roebuck in their mail order catalog.
I took a pick of a page in my 1909 Sears Roebuck & Co catalog. Look bottom left is a Wizard Cuff Holder. Look along the right hand side of the page and you will see Mens Linen cuffs, Boys linen, celluoid and rubber cuffs. Apparently collars and cuffs were added to a shirt for dress up.
I wonder if you could dress up and old dirty T shirt lol for Sunday church. I remember as a kid we always had our special "Sunday go-to-meeting" shirt. I even see they sell clip on shirt fronts. Apparently they needed clips for everything even socks.