Earmaster Model 550 "Golden" In-the-Ear Transistor Hearing Aid This Earmaster Model 550 "Golden" full-shell in-the-ear hearing aid was manufactured by Earmaster Inc. in 1965. (There is some doubt whether this is really the Model 550, or one of the 3 earlier models, the 300, 400 or 500 that came out between 1962 and 1964.) The only identifying numbers are on the front of the ear hook (5DLTL). This is a large full-shell model for the left ear. |  | Click picture for larger view | | |  | | | |
| A unique feature of the Model 550 (and models 300, 400 and 500 also), and the reason for calling them "Golden" is that the case was made of electro-formed nickel and then plated with real gold! This made for aesthetically-pleasing aids. Also, they were completely hypoallergenic. The white soft plastic band near the tip provided a better seal to prevent feedback.
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| Rear view of the Earmaster Model 550 showing the flesh-colored faceplate. The vent hole is the tiny hole (top center). The microphone port is the larger hole below it and to the left. The screw to the right of the microphone port is a screwdriver-adjustable volume control. This was a large in-the-ear hearing aid. The faceplate measured 1¼" from top to bottom.
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| Another view of the back of the Earmaster Model 550 showing the battery door opened. This aid took a #312 battery.
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| View of the Earmaster Model 550 in its original case.
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| Outside view of the original Earmaster Model 550 carrying case.
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