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  Gruen MainspringGo  ![]()  | New Topic  ![]()  | Find-Or-Search  ![]()  | Notify  ![]()  | Tools  ![]()  | Reply to Post  ![]()  |    | 
 What is the mainspring for a Gruen Verithin 17 jewels pocket watch serial number 4-220404. I can not find a cross refference. Can anyone tell me what msg is needed. Thanks for the help. mrmel.mrmel@gmail.com  | |||
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