Serial number--600167,I had a chat with an old timer on "strat-talk" he used to work at fender in the 60s,he remembers fender making these basses,he said its probably the last guitar Leo designed for them,everyone thought they were a bit odd in the 60s,he also told me that fender only sold a couple of hundred of them right through its production run,he said that they was stacks of bass V body that where rerouted and cut for the swinger/maverick