I happened to acquire a brand new Severne Overdrive from a local shipping company that had it in their shed for years but can't find details online. It's had it's luff sleeve eaten away by mice but still rigged very well. It is a 6.5 but can't get any info as to what year it is. I have downloaded archived manuals from 2017 up and nothing. I rigged and tested it with an Aerotech 100% carbon mast and seemed good but there might be more to fine tuning it.

Sail Repair WA said..
Hi JP 747

Pretty sure this is 2009 / 2010

This would still be a pretty good sail, even with the rat chew holes on the luff sleeve :)
The rest looks in pretty good condition.

J

Hi J, That seems about right, however, the color scheme on the catalog only has this in blue/white and the sail's luff at 468 but this at 467. It could be some other year other than this. When I rigged the Aerotech mast and downhauled to specs, it seems like the very bottom cm batten was bulging just a bit more. Maybe, it just needed more to flatten it out.