I always buy online the problems have been pretty much zero you just have to know where to shop. For extra assurance I use PayPal or my credit card. I recall on 1 occasion having under guarantee work done on a grey market Citizen (Amazon)
Citizen even refunded my return postage. Maybe it's just Citizen as a brand but I have used them a few times now and the service is outstanding.
That's why I love Citizen as a brand because they stand behind there products 100% regardless of where you have purchased them.
I am not affiliated with Citizen in any shape way or form just a happy customer.
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Citizen Eco-Drive (Eco-Zilla) BJ051-05E
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Rolex GMT Master Pepsi 16700
Seiko Orange Monster second gen SRP309
Seiko Fifty Five Fathoms SNZH57K1
Citizen Automatic (Auto-Zilla) NH6934-08F
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Scurfa Belldiver 1