It's the PB 1839.
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The construction is Shedua facings. Fretted Rosewood, 4 strings, 21 frets.
It has the full active elect ron ics, volume (pulls up for pick attack), pick up pan and two tone controls with the push pull/boost facitities.
Neck is the usual Wal multi laminates of maple / hornbeam / mahogany.
Built in 1981 and signed off by Ian Waller and Pete (The Fish) Stevens himself in control cavity.
The bass is in excellent condition,