I think the Gemini I bought a few months ago
is the Gemini from the RB4 shindig from several years ago.
the short clip on Youtube - small boats big seas, would seem to point that way
as the colour scheme on the hull and tubes is pretty distinctive.
Also the fact that it has an under deck tank that runs the full length of the boat may also be a give away. I know there are threads in the Rib Net archive, but I wonder if anyone associated with the boat at that time who is still an active member of the forum has a record of the serial number so I can confirm this?