Amplifier of the middle of 1980s with a head serviced two years ago. The amplifier was used outside home only three times in five years because it was always kept at home and protected against the dust. With the original Celestion 15" cone. The only defect, except some little scratches due to the use, is the knob of the potentiometer of the bass volume that was replaced with one that has the same look (visible in the third photo, it is the first knob from the right). The full specifications are here: http://www.drtube.com/schematics/marshall/ibs.pdf Size 57x62.5x36cm.