I think I may have come across a fake. It says Made in Korea.
Item: Vintage Brown Leather COACH Purse Handbag Bag
List: 321073262764
Seller: gmc_2012
Link: http://www.ebay.com/itm/Vintage-Bro...764?pt=US_CSA_WH_Handbags&hash=item4ac17530ac
You're correct. That's one of the few Coach rules for which there are no exceptions. Coach never made bags in Korea.
ETA: Someone might want to look at the Willis in this lot listing from the same seller. Is the serial number font "off?"
http://www.ebay.com/itm/Lot-Coach-H...790?pt=US_CSA_WH_Handbags&hash=item4ac17d00c6
Not just the font - the whole turnlock tab is noticeably crooked, and the "pillowed" area of the tab isn't the right shape or size. I doubt if it's real but I'm not really comfortable reporting it.