I'm helping a friend sell his Marshall JCM800, and I'd love any advice or info some of you more knowledgeable ladies and gents could provide. JCM Lead Series, 100 Watts Model 2210 New tubes (not sure what brand,) recently serviced. Cab is 1960A with 412 Celestions Both made in England. Can anyone tell me more about this amp & cab? Year made? How much would it be worth? As always, thanks in advance to all you wonderful people.