I found footage of that same concert which shows Mike's Alembic much better.
 

 
And yes indeed, he has the strap on the lower bout, probably to improve the balance of that bass.

Mike Rutherford can also be seen playing an Alembic S1 on the Three sides live video (a documentary about Genesis during the Abacab tour) : This VHS tape was published by Virgin some 25 years ago. It has to be said that Mike only used his Alembic for 2 or 3 songs in this show (Darryl Stuermer played a Fender Precision I think when Mike played the guitar parts). On the Mama tour, he used a Status S2 (A Strata to be more precise - The previous name of Status before Fender asked Rob Green to change it because it sounded too much like Strato).

I've just found this :

Wow, that's from the Six Of The Best reunion concert in 1982 where they had quite a full stage, with Peter Gabriel (seen playing percussion on the pictures), Steve Hackett, Mike Rutherford, Phil Collins, Tony Banks Daryl Steurmer and Chester Thompson.
 
There are bootlegs from that one off reunion performance but no official recordings or films which is a damn shame.
 
(Message edited by Blazer on August 02, 2007)
 
(Message edited by Blazer on August 02, 2007)

Yes that's right. I have the 2 CDs bootleg and the sound is really poor. Just for fans I suppose.