Although I've seen NGC designate Mint State coins with Cameo, I've never seen an NGC-slabbed Ultra Cameo business strike. The closest I can think of are some SMS coins, which everybody characterizes as "sorta-Proof" anyways.

I agree with Bryan - almost certainly a clerical error. Furthermore, there's not a single reason to purchase such a coin in either MS- or PF-70 at this moment - they're just hitting the market and going for stupid money.