Picture credit: 

Pictures from the owner used with permission.


S. Newkirk

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Only five of these 4003/5 basses were made. They were a prototype for the Rickenbacker 4003S/5 model. It has the regular binding of the 4003 model with a maple fingerboard. The serial number suggests it was made in 1986.

The owner says that this model was a prototype for the 4003/S5 and only 5 were made.

Link: More information about this guitar at the Rickenbacker Registry