Barts in that casing size can be CB or OB (OB = Original Bass, deep tone); dual coil 2-wire, dual coil 4-wire, or quad coil (dual rows of split coils) with a ton of wiring options. I think I've had them all in different basses. One of my favorites was the quad coil deep tone setup with 3-way switches for each pickup...even the 'single coil' setting were split-coil and hum-free. That was all before I entered the world of Roscoe!
Edit - Apparently, Bartolini recently started selling a true single coil mounted in this shape, too! I think they call it their Singularity series.
Edit - Apparently, Bartolini recently started selling a true single coil mounted in this shape, too! I think they call it their Singularity series.
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