Hi PeeWhy, and welcome to the forum.
Nice amp!
New model to me too, so thats clearly a pretty uncommon amp. As David says its a very late OMI model - May '79 on the date tag means the very last months of production before Orange went dormant 'till the mid '90s.
Cool bass combo. Would be nice to get some clearer shots if you can PeeWhy, especially of the control / back panels.
I see the valves hang downwards on that amp, as opposed to facing the rear on the OR80 / 120 combos. That might cause (overheating) problems if you ever wanted to upgrade it to an 100 watter. (Probably only two more valves / sockets needed - the transformers would almost certainly handle the extra power.) If you ever did that I'd be tempted to install a cooling fan - not something you'll often hear me suggest!
Great find. That should sound huge for guitar, and will make at least one member here pretty jealous. (Le Chat Noir - he plays in a 2 piece and likes bass amps for guitar!)
Andy.
aNDyH.
Ever tried to outstare a mirror?
In the bathtub of history the truth is harder to hold than the soap, and much more difficult to find!