400 Day Clock Suspension Unit 54A can be identified in the Horolovar 400- Day Repair Guide and is the same as Unit 54AA, 54B and FHS 977. To decipher what type of suspension unit is needed you must first identify the back plate of a 400 day clock using the Horolovar 400- Day Repair Guide. To be used for Hermle 77 Quartz, Hermle 977.
Hermle part number is E021-02370.
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A
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B
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Total Length
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74 mm
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3.5 mm
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91 mm
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Note: Please see enlarge image for measurement explanation.