1979 Marshall JMP100 Superlead

What an amp! 1979 Superlead Mk2 with cascades of rich, thick tone. 
No service history, but appears to be all original and working 100% perfectly. Has definitely seen some action. Vent grill on top is broken, knobs appear to be modified and usual rips in the tolex. 
Also for sale 90s 1960AX quad box with 4 x 25 watt Celestion Greenbacks. Great match for the head. Will sell separately. 
Head $4100, Box $995. Both for $5000