If I were own just one bass, it would be one of these. Now I do! The EB-3L is the long scale version of the EB-3 and was available from 1969 to 1972.
The serial number is 954437 and has been dated as being from 1969. It has the unique "slotted" headstock, similar to a classical guitar, and the Gibson logo is raised above the surface. It features a mini-humbucker in the bridge and a fig fat sidewinder humbucker in the neck position. The 4-position switch selects either pick-up, both together, or the neck pick-up through a passive low pass filter. Like a lot of Gibson basses, the sound is very deep and fat.