From someone who holds a ton of Cas:
If it is this urgent, peel the damn thing. There are plenty of wallets that will allow you to do so. No offense, but the world won't be missing a 2013 brass Cas; sell the peeled coin here if it will make you feel a little better. Don't compromise your financial/life situation to preserve a piece of history, which in the case of this coin -- is abundant.
I'm considering doing just that with my 2012 Cas. Thoughts on that?