Delta 501 "Gold Stripe" Dictograph R-3 ca 1923 Electro Importing Co. New York 3000 ohms very rare
Durophone by Warren Dymac type F Dietzen Tri-Pole Davega, obviously a Frost 161 made for this shop
Eisemann ca 1922 Elwood ca 1923 Everett ca 1924
Everett Type E-2 ca 1922 EOSH 2500 ohms
Electrical Products MFG, 2000 ohms, very uncommon
EDESON RADIO 1500
This is an interesting thinly veiled infringement on the Edison name. Still it has a cute radio icon and 3000 ohms for the pair, rare set, circa 1924.
The Dictograph R-1, R-3, and Aristocrat look like more modern headphones but the magazine ads show they were made in the 1923-1925 era and they have very good tone and sensitivity for crystal radio use.
Durophone and Dymac were fairly cheap consumer grade headphones.
The Elwood and Everett headphones were good quality made sets.
The Eisemann headphones weresolid and well built, hard to find.
The Eosh and Edeson sets pictured above must be rare as I have never seen another pair of either than these ones.
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Delta headphones December 1923
Delta headphones Radio News, November 1922