Champagne Building on Kimberley Road, Tsim Sha Tsui (Subway Station: Tsim Sha Tsui, Exit B1). The building (next to the Miramar Hotel) is due for redevelopment, but a number of watch & watch accessory shops remain. There are also used photo equipment ...
But as always, it's caveat emptor (buyers beware) when shopping for second hand products. Please do exercise due care and diligence. Be vigilant. I do window browsing whenever I am near, but I have not bought anything from any of the shops. Happy browsing...