Fender teamed with Leslie in the late 60's to produce the Vibratone cabinet (rotating speaker cabinet for guitar). This was designed to work in conjunction with a Fender amp. Leslie in the early seventies released their own version the Leslie 18,which is identical except it had a full range JBL speaker.
The Leslie 18 was used by SRV on his famous tracks like Cold Shot etc.It was also featured on Dark side of the moon and many Beatles tracks.
This unit is very rare and I have never seen another in this country.
The back is missing (it was only ply anyway) it sounds better this way. The unit has also been modified as most were, to have the speaker on at all times,this stopped volume drops when switching from amp to Leslie.
I recently had a crossover made by Leslie ($200 US),so you could convert back to original spec if desired.
The speaker needs replacing and I have priced unit accordingly.
I would be happy to ship interstate,and can source a quote.