Somebody rigged a stem from a Grabow Omega to that thing, it's not a Grabow Meerschaum, but they did exist. Here's an old ad and some words on the matter from the former head of Grabow and Mastercraft, both of which shared the same building.
"All the Grabow Block Meerschaum pipes were made in Turkey and were hand carved block meerschaum. None were pressed (massa) meerschaum. We did trademark them in Sparta.....put in the spade.....and the TM was always black. Thats how to tell it is a Grabow. There were many shapes that were not pictured in the brochures since the maker didn't "hold to" our requested shapes. Mastercraft did sell a great many massa meerschaums and also several block. The massa is easy to spot, but the MC block is no different from anyone elses. ......TED'