Same as used for a Tele, Or Precision Bass
The codes are "304-6101" and "304-6122" which date them to the First and 22nd weeks of 1961 (January / June). The original wires are still attached and they come with the original Washers and Nuts.
These were removed from a 1961 Pre CBS Fender Jazzmaster. The Neck was dated 10-61 and the Body date June 1961.