My best guess is that it's a Marshall 2049 cab from 1973-1977 but it may be in the later part of production as the livery matches the later JMP style rather than the chequerboard grille cloth of earlier models I've seen.
The cab I'm getting looks like this, but is Orange (?)
![Image](http://www.ampaholics.org.uk/79%20mar%20100%20stac.jpg)
From Doyle's Book: the 2049 is "Marshall's tallest 2X12, about 4', designed for 50-watt artist series".
Anyone know anything about these? Particulalry rare or desirable?