As an Australian I get this a lot, you see a watch you want and its CONUS only, most of the time the seller has seen Crocodile Dundee and likes Australians but occasionally you get someone that probably thinks we were part of the Warsaw Pact or are located in the mountains between Switzerland and Germany and decline.
Most of the time its that the seller does not want to ship to certain countries that are known for scamming, or quite unfortunately for the locals, Italy due to its world famous postal service's reputation for thievery (I feel genuinely sorry for the huge number prolific watch collectors in Italy that both have to deal with that postal service, and the stigma its created for their country among international sellers).
So CONUS is sort of short hand for "I don't want to get ripped off, so I don't want to take chances with buyers from country X, Y, Z etc" without having to be so verbose about it.
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