The price went up incrementally so I think it was a bidding war and not a typo.
I hope it's a genuine chip they're getting and not one of the many remarked fakes coming out of China (it did look genuine).
No wonder there are so many fakes being produced if that's what they go for nowadays.
There is another double crown chip on ebay now.
The difference is I'm pretty sure this one is fake/re-marked because the serial number has the wrong typeface which is usually a dead give away.
I sent a very polite message to the seller advising him of this. Unsurprisingly I haven't had a response.
I hope nobody pays silly money for it.