I got the phone yesterday, and it looks pretty good! I can absolutely tell that this was made as a promo by Bell System l, because the color exactly matches my med blue 500, and the inside of the shell even has a cheesy smell

!
The fingerwheel was originally glued, but at one point was ripped from the molding and had a hole drilled right through the fingerwheel to accomodate the screw-on pen holder. Fortunately, this problem can be solved by using a screw and nut, and I can put that freely-moving fingerwheel to good use! As for the music box inside, it easily came right out with four screws. The music box mechanism itself was held on the bottom with pieces of balsa wood held together with roofing staples (Walt Barber doesn't seem like a very big company). The music box mechanism is labeled "Switzland", so it was either made there or the company was from there (also labeled NYC).