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6084--784,k SN, ca. early 1950s, "Semi Bubbleback" Chronometer--posted by tomvox1

May 19 2008 at 1:50 PM

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Note: "The earlier BB has a fully sealed movement, meaning you will need to remove the top rotor set plate in order to work on say adjusting the +/-: calibre 6xx.

For the later movement, there is a small part of gap allow for that adjusting, an improved version, calibre 7xx. and because this half-sealed movement, many called it Semi BB." - Chin


    
This message has been edited by tomvox1 from IP address 70.107.80.184 on May 23, 2008 12:19 PM
This message has been edited by tomvox1 from IP address 70.107.80.129 on May 20, 2008 2:57 PM


 
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