Adding my info to this thread:
1985 Mesa Boogie Mark III, #1543X. No-stripe, DRG, with the 105 power transformer and IIC+ faceplate. Imbuia cab with wicker grill. Electro Voice EVM-12L speaker.
Mesa factory serviced, including a cap job, with Mike Bendinelli upgrades... III+/IIIC+/IIC+ circuit...