The Old Bones JM Classic is based on the earlier Jazzmaster pickup; it sports the pancake style bobbin construction, but made with AlNiCo 3 magnets and a slight overwind.
 
A3 magnets and a slightly hotter wind give this pickup a bit more grit, and a slightly darker tone for when you dig in and want to throw some overdrive/fuzz into the mix, but they still have all the clarity that you could want. I make these RWRP so that when used in the middle position they hum cancel.
 
These have DC resistance reading around:
Neck: 8.0 Kohmns
Bridge: 9.0 Kohms
 
VAT for UK customers added at checkout