DouglasSkinner Posted June 13, 2015 Share Posted June 13, 2015 I have an A. Schild watch movement with a broken mainspring. Searching around I found that the Marathon No. 745 is the right replacement. The numbers are as follows: 7 x 11 10 1/3 which I assume mean: Dennison width: 7 Dennison strength: 11 Dennison length: 10 1/3 However what I'm calling the Dennison strength could actually be the Dennison length, not sure. There are two other numbers on the Marathon 745: 1.6 x 10 which I take to mean: Metric Width: 1.6 mm Metric Strength: 10 1) Is my interpretation right? 2) Would a spring with the following be a proper replacement? Dennison width: 7 Dennison strength: 11 Length in inches: 10.5 Link to comment Share on other sites More sharing options...
bobm12 Posted June 13, 2015 Share Posted June 13, 2015 Maybe ofrei has the spring by movement and this will clarify what it is all about...for both of us?! Try and give them a call, they can be very helpful if you get them in a happy mood...I mean sometimes! :) Cheers, Bob 1 Link to comment Share on other sites More sharing options...
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