I wish that I had seen this thread yesterday; I recognized those transmissions right away. Actually, there were not any Blackstone laundromats around here that I can recall. We did, however, order one coin-op machine just to have on display in the store. We sold it to a friend, but had to drill a hole in the top of the coin-op part, and put a longer shaft on the timer, so they could wash clothes in their house, without the use of the quarters. I still have the coin mechanism; as a matter of fact, I was just looking at it in the attic yesterday, deciding whether or not to keep it. Two quarters for a wash.
Other than the arrangement of the timer, the only difference between commercial Blackstones and household ones was an extra ring around the outside of the tub, apparently to lessen the chance of off-balance loads. There might also have been an extra clothes guard around the top of the tub.