Ok all. I spoke with Mike B at Mesa today to get the lowdown on this amp. He said given the serial # and the date code it could be either a blue or a green. The sure way to tell he said was if the outer power tube sockets were wired in pentode or triode. So I opened it up today had a look and took some photos.
As far as I can tell, these sockets are wired pentode making this a green stripe.
While I had it out of the cabinet I had a look at the OT code. It's #562003. According to Boogiebabies on this board it's the same OT as a Mark II C+ with a different part #.
See post about 2/3 the way down http://forum.grailtone.com/viewtopic.php?f=3&t=10308