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Watch Case Part Assortments

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                                              JBC Legacy Watch Parts Database

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                                              MS-JA406

                                              MS-JA406

                                              Mainspring 21-6.5-27 Db - MS-JA406

                                              $30.19

                                              Illinois Mainspring
                                              • Width : 3.00mm
                                              • Strength : .155mm
                                              • Length : 27.00 in.
                                              • End Type : DB - Double Brace
                                              • Size : 16/S
                                              • Factory Number : 47309

                                              Specifications

                                              Historical items
                                              BC0112037
                                              Interchange items
                                              BC0112037, JA-406, and JA406
                                              Weight
                                              0.1 oz

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