Contact
Include the address of the listing if it is about one — it saves a round trip.
Reporting a listing
Send the listing address and what is wrong with it. Listings that are not Japanese watches, are duplicates, misdescribe what is being sold, or are posted by someone who does not have the watch are removed.
Messages between buyers and sellers
Those go through your messages, not this address. Nobody here reads them, and mail sent to this address about a private negotiation cannot be passed on.