Hi gear pagers. I would like to pull on your knowledge. I have a chance to get a Marshall combo amp but am unsure what it is. I'll give you what I have. The dude says it is a "JTM 50w Tremelo." The faceplate is as follows: Vol 1, Vol 2, Bass, Mid, Treble, Presence, Speed, Intensity. It has the four inputs like an old Marshall JTM that can be jumpered. It has two Greenbacks. And on the faceplate on the right end it simply says "JTM." The serial number that he gave me is 954360132. Can you help me with this?