Omikron Model 111
The Omikron Model 111 transistor hearing aid was manufactured by
Micro-Electric Ltd. of Zurich, Switzerland in 1957.
Controls include a volume control on the top left corner, and a
four-position on-off/tone control lever on the top right corner. To turn
the aid on, you flip the lever to one of the three tone positions—I, II
This hearing aid contains a t-coil. The two-position
sliding switch on the right side is labeled "M" (microphone) and "T"
This hearing aid is 2¼" x 1⅜" x ⅝" thick.