They tend to service the Japanese market.
I've never successfully managed to order anything from them, or get any replies to emails, so good luck... let me know if you hear anything.
There was an English site they had, but the guy running it scammed people and disappeared. Don't know if they are still related to Watchonpo.. so just a FYI.
Also, Watchonpo have been known to commission watches in the past, such as the best case version of the PAM187 (look for kruzer's reviews and comparisons) although it was in the early days of the Asian 7750 and it had the low beat version, which at the time had question marks.
They've also managed to get exclusive watches that no one else has - eg. is the aforementioned PAM187 and also the PAM194, which they are the only ones to have in titanium. The collectors on here, sadly, have it only in incorrect stainless steel.