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/fa/ - Fashion

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>> No.15030199 [View]
File: 191 KB, 1200x1200, Grand-Seiko-Spring-Drive-8-Days-SBGD201_05.jpg [View same] [iqdb] [saucenao] [google]
15030199

What's the deal with spring drive movements? Why are they so much more accurate than standard automatics an with much longer power reserves? Is it an actual distinct type of movement or just grand seiko marketing?

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