Upon examination, this object possesses an area upon which the unit's serial number should be imprinted. However, that area is blank. It would seem that some special circumstances surround this unit. Also, a PCB has been added to the unit which reads "Disk Jockey 2D/B Copyright 1980 George Morrow." Finallly, the item has four (4) cables attached to the back of the unit: two ribbon cables and two serial cables (one of which is labeled "MODEM"). The top cover, which is loose (two retaining thumbscrews are missing), is also a different paint color than the rest of the metal.