| Name | GRAY 50G MULTI-COIN PREPAY THREE SLOT WITH DIAL |
| Date | 1920 |
| Manufacturer | Gray/Western Electric Model 50G Payphone. First three slot with a dial |
Development of the US-GRAY_50G MULTI-COIN PREPAY THREE SLOT WITH DIAL Payphone
| The 50G belongs to the Gray–Western Electric Model 50 series, introduced as Bell System standards for three-slot payphones after 1912. The “G” suffix denotes dial operation, reflecting the wider rollout of automatic exchanges in U.S. cities during the 1910s–1920s. It is a true prepay instrument: coins had to be deposited and validated before the call could proceed, eliminating operator supervision. Coin signalling used distinct gongs so central offices could audit deposits acoustically on the line. The phone typically paired a Gray coin collector with a Western Electric dial telephone set, reinforcing Bell System standardisation. Installation focused on high-traffic interiors—rail stations, hotels, department stores—prior to widespread outdoor booths. The 50G represents a key step in shifting payphones from mechanical novelties to reliable revenue infrastructure, enabling large-scale, unattended public telephony under the Bell System. |
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