The Wurlitzer Electrical Selector Assembly # 54791 seen here came from a model 1600 or 1650 mechanism that I parted out in August of 2014.
It appears to be complete and in good condition, but there is some surface rust on the junction box and the centering pin on the male plug is missing.

It is used in models 1600, 1650, 1600A and 1650A.
Models 1400 and 1450 also use the same part number but do not have one pair of brown wires coming out of the junction box to the counter mounted under the front edge of the mechanism.