Yup, it's a Mk II. The S/N on mine is in the 10XXX range, & has black knobs.
What features does yours have (EQ, 60/100W, reverb)?
These amps are great. They're not Mk IIs, but they are bargins. Great clean tones, rugged, & sound good cranked. I call mine "the Pocket Bassman". :)
Dirt