Pennsylvania Type E, by Hamburg Pennsylvania Type B, by Hamburg 3 conductor grounded shielded cord, aluminum earcaps (Uncommon)
Perkins by Warren Radio Phone Mfg Penn Headset Co. Philadelphia (rare)
Philmore Pure-Tone Pival 600 ohm possibly European Precision by S.A. Potter
PAL: Cheap 1000 ohm headphones, went along with the PAL radios, fairly uncommon.
Pacent: Cheap 2000 ohm headphones, Pacent also made various radio parts early to mid 1920's.
Peerless: One of the models of headphones by United Radio, not bad for sensitivity and good general construction.
Pennsylvania: Hamburg Bros also made the crystal radio, type B and E headsets mid 1920's.
Perkins: Also made their own crystal radio mid 1920's, pretty uncommon set.
Penn: A rare headset and well made.
Philmore: Pure-Tone cheap consumer grade headphones to go along with their kid level crystal radios.
Potter: Another uncommon 1920's set that seems well made with good sensitivity and tone.
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