One has a zip coin pocket and both have a D-ring that allows you to attach your own chain or keys.

Double Snap Wallet This wallet has one pocket and three slots for cards, plus a compartment for bills. Double snaps keep it securely closed. D-ring to attach chain, keys, etc. (4" x 4 1/4") - DSW $43.00

Zip Double Snap This great wallet has the same design as the DSW with a zipper added to the side pocket to accommodate coins. (4" x 4 1/4") - ZDS $50.00