I don't have C18, but I have Hermes2002 26. I don't like to keep any of my Kelly wallets inside Hermes2002. I like to pair a flat wallet with Hermes2002 ( bearn mini cardholders, Calvi card, Bastia...)
My wallet is $1300 in Epsom
I have this wallet, too. It hold coins, cash, and multiple credit cards. Mine is epsom, Vert Bosphore and priced at $1300 pre-tax. It "fits" in just about every mini bag / WOC I own. However, the turnkey on this wallet is a real issue if you use small / mini bags. If the depth is not there in the bag, the turnkey on this wallet will do some damage.
Good call on the turnkey damaging the inside of the C18...I didn’t think of that but totally makes sense. It’s so cute and would be perfect for me as a wallet!