If it is the cab I think it is, I have never seen another one like it. It appears to be Mesa from all the exterior accoutrements. However, I have still yet to see Mesa use a round port much less two. Then, the upper portion of the cab would never be quite right as a sealed upper. As it is, sealed it is more like a pair of Thieles. With the back panel removed from the upper it would have to be rewired in order to use the upper portion at all. Then, the upper would be able to be used but it would still have the round port holes in the baffle. To me, it sounds more like an aftermarket modification of the cabinet or a nice clone job that was custom done to have the upper section ported. Again, I have never seen a Mesa guitar cabinet with round ports.
