not so sure, my watch from watchoutz comes with japan store stamp, so I believe have int'l warranty
for the prices, you can go yahoo hk auction to ssrr for a gauge

no lah .. most Teochew there can't speak Teochew even there is quite a lot there, also they may mistaken u for Tiong
Speak Canto or English best ... mix also ok , get good service. Mandarin is a big no no. used to go there for work and holiday (tried once went there thrice in a year) rast time (maybe 15yrs ago) their service is very jialat , especially the street market, touch no buy kena ****, bargain no buy kena **** & ****... even stand see no talk no buy oso kena ****