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Here's a replacement key for your Hermle 350, 351, 340, and 341 series clock movements. It will also fit some Seth Thomas, Gilbert, Sessions, Ingraham, Waterbury and other antique clocks. Brass key with winding end in size #8 or 4.25 millimeters. This key fits many antique American clocks as well as Hermle 340 and 341 movements.
To confirm the key is correct size measure the square winding shaft. The square opening of this key is 4.25 millimeters.
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