I saw several Techinum 753 frames that the rings around the joints were broken. Only bought mine after making sure it did not have any broken. Maybe the ones on ebay are the broken ones and the good ones are still out there.
The fork does look like a match.
As I recall, the rings were merely cosmetic and served only to cover the join line. The people who have posted here about damaged Technium bikes crashed them or drove into a garage with the bike on a roof rack. Bent frame tubes, but intact bonded joints.