400 Day Clock Suspension Unit 18A can be identified in the Horolovar 400- Day Repair Guide and is the same as Unit 18B and 18C. 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 Petersen Standard 53, Petersen Standard 54.
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A
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B
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Total Length
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111.5mm
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6 mm
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136mm
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Note: Please see enlarge image for measurement explanation.