Good question on whether the Korean ones used the Trinitron name... The one that comes to mind is this one now on eBay:
http://cgi.ebay.com/SONY-COLOR-WATCH...QQcmdZViewItem
I can't see any "Trinitron" badge with that seller's single not-so-fine photo.
After that model, they went to all LCD for small portables. I think those may be real Sonys, but who can tell anymore?
Charles