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NOTE: There were at least two Keystone telephone companies located in Pennsylvania between 1894 & 1945/46.

The earlier known as the Keystone Telephone Co (approx. 1894-1898) was located in Pittsburgh. Additionally, there is evidence of the Keystone Electric Telephone Company (approx. 1901-1905) operating from the same address as the Keystone Telephone Co. Telephones and telephone parts produced by various manufacturers with Keystone attributes were utilized by Keystone from the Pittsburgh era. Some related manufacturers most likely were Western Telephone Construction, Sun Elec Mfg Co., Manhattan Electric Supply, American Electric, Northwestern Telephone Equipment Co. and Burns.

Keystone Telephone Company of Philadelphia conducted business from approx. 1900-1945/46 and utilized telephones manufactured by American Electric with attributes specific to Keystone. These attributes seemed to vary depending on the production year. There is speculation that all the Keystone companies were in some way related.

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 Shown here are two Keystone tags which are normally found attached to the front of the mag box on a wood wall phone.

Note the difference in the names which is explained above. They are identical other than the font size of "KEYSTONE" and one having "ELECT" stamped into it.
Click for Close-up For larger view, click on thumbnail Keystone Telephone Company

c. 1900

This 2 box wall phone produced by American Electric for Keystone has been a conundrum to me since I obtained it a few years ago. All the wood is correct and pictured in the American Electric 1900 catalog as the long distance #30 telephone. The magneto is labeled American Electric and inside the door is a Keystone Telephone Co. quality control paper label. The wet batteries (also shown on last page) are Keystone. Interesting is that the triplet, #5 arm and 259W transmitter are all produced by Western Electric.

I have been advised replacement parts, i.e.: receiver, transmitter, etc., were likely produced by other manufacturers and purchased by Keystone. I would be interested if anyone has any additional info.
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 Keystone Telephone Co. (Pittsburgh)

Pair of Glass Battery Jars (Wet Batteries) for earlier wooden wall phone.
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