Marshall 2104 combo amp, in the studio (w/ Kerry Brown's hand on it)

Marshall combo amp, containing the 2204 amp head in a 2x12 cabinet (two 12" speakers). Made from 1976-1981. Earlier models used Celestion G12-65 15Ω T3054 speakers, while later models used T3120s.
[product info] Seen in a studio video from 2009/09/28, during the recording of Teargarden, in which Kerry Brown answers some fans' equipment-related questions.