This is most definitely a Taiwan Ketch of which there were several designs. May be a Vagabond 47 or somesuch, probably built in early/mid eighties. I am currently in the early stages of purchasing something similar.
The origin was a William Garden design, built in Taiwan for the US
market, but a number of knock offs also appeared. I used to sail on one which had been built by a gentleman by the name of Seadog Deng. It had a Perkins 4.108 which caused consternation by overheating. Turned out it was a nonmarine one built in Spain and later marinised in such a way that it was driving ahead through the astern geartrain. Seadog Deng, when tasked with this, replied "What's the difference?
The wooden box section mainmast panted fore and aft to a quite remarkable degree, when under way, thanks to an implausible staying arrangement.
Quite correct regarding the William Garden design brief. Formosas, Vagabonds Hardins et al, and usually featuring carved panels on the interior doors. It is reckoned that the carvings were done by families in each yard and that experts there can tell which families did the carvings. As you say some better finished than others, also most but not all feature the clipper style bow and all are usually rigged for the US market as staysail(cutter) ketches. Many were fitted out in the US also.
It would be fair to say that she was a nice boat to sail, easy to singlehand, and had she been cutter headed rather than sloop headed (Garden is a very good designer and I am sure that this was what he intended) the mast would have remained in column. She was a club boat and led an active life in Hong Kong, which took its toll on her.