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Showing results for tags 'dennison width'.
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I have an ETA 2750 movement and I need to replace the mainspring. My catalogs don't cover this caliber. The current mainspring, based on my measurements has the dimensions Dennison (Metric), W: 5 1/2 (1.45 mm), T: 9 (0.13 mm), L: ~ 14 1/2" (368 mm). However, due to its age and the fact that it's been serviced before I'm not completely sure the old spring is the correct one. So my first question is are these the right dimensions for the proper mainspring for the 2750? My second question is does anybody know some part or catalog numbers for the correct mainspring by some different manufactures of springs, such as Marco, Nu Vigor, Sandsteel, etc.? I have some cabinets of mainsprings from which I might be able to get one but I need to know the a catalog/part number--some number I can cross reference to what I have. Hope this makes sense. Thanks.
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