Sure don't..... Marshall started making 8 x 12's back in the 60's for (i think pete towshend) but due to the weight and portability jim marshall came up with a solution one day to bascially cut one in half and the stack was born..i never knew they went back making them in the 80's.... i would reckon your trousers would flap if you were in front of it going full tilt through a 100watt head......i've had the pleasure on a couple of occasions back in the late 80's early 90's with two 4x12's(one borrowed) and a ex Thin Lizzy 100 watt Burman head and cab i picked up for peanuts when i was a lot younger and bit mad....an unforgettable experience...stupidly i traded the burman head and cab in off other gear on the advice of someone who should of known better....i was young........
i'm a bit of a marshall nut myself , i have alot of material about all kinds of marshall gear , and i have never seen one like that before . you are right its not a common cab .