Antique Cuff Holder or Holdout Device The Derby

Antique cuff holder or holdout device for cheating at cards.  Or it could be both, I am not sure.  There is a spring clip on one end, and a horseshoe at the other.  On the stem, one side reads "The Derby", on the other is Pat Nov. 29, 1898.  It is silver in color, and in very good condition. 

I have found information that it was made by John C. Plicieer who applied for a patent in Nov. 4, 1898, and received it Nov. 29, 1898.  I have tried to find a copy of the patent, so far no luck.  Cuff holders were used on detachable cuffs, a shirt would be worn several times with the collars and cuffs replaced daily.  Used for cards, it would be attached to the cuff, with a card slid into the prongs.  Either way, it is a nice little piece of history.

Total length 2 3/4 inches.