The T20s are very nice little flashes. I have two
.
They should work fine with a Fujica STX-2.
They aren't particularly powerful, but the auto exposure functions give good results.
They don't swivel or rotate for bounce, but they are nice and light and small on top of the camera.
Make sure that the flash has the sliding distance scale for the back panel. They are sometimes missing, because the method for converting the flash for TTl use with certain Olympus cameras is to remove and reverse the distance scale.
These were made for both US and international markets, so if you prefer "feet" and aren't comfortable with metric measurements (or vice versa) make sure that the distance scale is one you will want to use.
I'd refer you to the main Olympus resource link for a manual, but it appears to be down right now.
This link isn't bad:
http://www.mir.com.my/rb/photography/hardwares/classics/olympusom1n2/shared/flash/t20.htm