[Boatanchors] Unknown PI Coils

[Michael Bittner]

Does anyone recogize these plug-in coils that I just got at a swap meet? 

https://photos.app.goo.gl/wp6PiLeswX4ri1Pq1

https://photos.app.goo.gl/9PCo6kyq6EPGGeBu2

They are wound on 1.5-inch diameter phenolic coils forms that are mounted on standard 5-pin tube bases.
There is a set of 4 coils marked Det for 160, 80, 40 & 20 meters, and 2 coils marked RF for 80 & 40 meters.  
The detector coils are tapped for a Hartley circuit.  Too bad the 160 and 20 meter RF coils are missing, although
I also got some matching blank forms that I could wind myself for the missing coils.
The markings on them are hand written, but they appear to be factory wound.  Look like the start of a 
nice regen receiver project and I'd sure like to find out more about them.

Are they really factory wound, or the work of an excellent craftsman?

Mike, W6MAB


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