That's a Big "M" cabinet that Marshall/Unicord marketed in the US in the late 70's to cut their import costs. A lot of differences, notice the MDF construction, smooth tolex and the crap speakers I can't remember what they were in my old cab but they had a really weird magnet design. Not sure what speakers those are in the pics. Mine had Marshall script on the corner protectors and a big U for Unicord on the handles.
I had one I picked up in the mid eighties even with Celestion speakers loaded in it I never cared for it, the MDF is just dead compared to a real 13 ply marine grade Birch Marshall cab, but as always YMMV. I finally sold mine thank god but I know a couple of players that actually like them.