Hi everyone (again!!!)
I've just found a deck of cards and I remember my cousin showing me a specific trick with them .... yet I can't for the life in me remember it

The deck consists of all 3 of diamonds - each of which has a different back design, except for 4 of the cards - there is a 10 of clubs and 10 of spades, these have the same back design (different from the rest of the deck) and there's also an 8 of clubs and 8 of spades which have an identical back design (different from the rest of the deck).
On the deck case is printed, "Mumbai 5001".
Anyone any idea what this deck is used for ???
I'm sure if someone just outlines the trick I'd remember the method and presentation, etc.
Thanks in advance
