I've got one, it's the short chassis model with a blue stripe. Below is my craigslist ad for it.
http://seattle.craigslist.org/est/msg/2789453304.html
Mesa Mark III Head Short Chassis (Blue Stripe) 100 Watts- in great shape. This amp has all the warm sounds you could ask for and all the brightness you can dial in. It has four 6L6 power tubes with a Simul-Class/Class A switch in back. The tolex is not torn on any side (as seen in photos). The front face looks great and the grill is still in perfect condition. The fourth revision was the "Blue Stripe" Mark III which featured a blue marker stripe above the power cord. The amplifier was voiced so bright, it is considered to be the most aggressive Mark Series Boogie ever introduced. The power amp was also altered to mirror that of the IIC+. Great sounding amp!
Location: Eastgate
it's NOT ok to contact this poster with services or other commercial interests
Jason