HISTORY of ATM
LOUD SPEAKING TELEPHONES
STROWGERPHONE - AE MONOPHONE
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Some ATM telephone have "SPL" stamped on the base close to the model number.
The usual 24C dials fitted on ATE/ATM phones had black finger plates. They
did fit "chrome" finger plates (they do not
not appear to be stainless steel) on 300 type telephones as luxury models for executives
and marked the phone as "SPL" following the LXXXX part number. They
also fitted this
"luxury" dial with a "pawl lifting cam" which stops the dial
"click/click/clicking" when it is wound up. The clicking was one of the
objections to the dial, but with this extra cam, it is as quiet as a GPO
Dial No. 10.