BASCO Briggs & Stratton Berwick by Triangle Berstan Radio Products
Brush Crystal Headphones Bannard (Very ucommon set)
S.G. Brown Type F (English) Branston 2500 ohms
Benwood Co. 2500 ohms
Notes on the above: also see scanned ads at bottom of page.
Baldwin: Nathaniel Baldwin made headphones with the moving armature for extra sensitivity, but were subject to deterioration in performance due to rust, cracked mica diaphragms, and bent parts inside, but when they work optimally were very sensitive. A bit heavy on your head. The Type C were the most pleantiful, but others were also made as pictured. In some you can see the assembly date written inside the housing with a red crayon. They made a Type B, C, G, E, N-2, and some with no model.
Bannard: Don't know much about these but are quite uncommon.
BASCO: Briggs and Stratton headphones to go along with their very rare crystal radio, these are among my favorite headphones, made in 2000 and 3000 ohms.
Berstan: Seem to be fairly cheap consumer grade headphones, fairly uncommon, sensitivity OK for local stations.
Berwick by Triangle: Well built headphones on par with Brandes in terms of tone and sensitivity.
Brush Crystal: These were piezoelectric headphones with very high impedance, the piezo crystal tended to deteriorate over time, so they should be kept in a controlled temperature low humidity environment. I keep them in a ziplock bag with a silica gel dessicator inside. Most pairs I have seen are dead, but when they work properly are very sensitive.
Branston: Canadian make 1920's headphones, Branston made other radio parts and Violet Rays too.
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Baldwin Headphones from Radio News, December 1923
BASCO Headphones from March 1923
Brandes Headphones October 1923 Brandes Headphones from Radio News May 1925