In the late 1970s Bachmann would briefly revive the Master Unit format and issue this unit. It was only available under this one production number and this number would not be shown on the top of this box. To find it you have to look on the side panel as is illustrated below.
EXCEPTION: We’ve violated our qualifications for these Master Units to illustrate this item. There were no internal box dividers in this item and each of the component pieces were individually wrapped in sealed bags. The reason that we have done this is for historical purposes and the fact that this unit is the "swan song" of the Plasticville Master Units.