Swiss made, alloy, vintage, new old stock mainsprings, multiple sizes arranged by dimensions. 37 types to choose from. Swiss part number 771(auto wind watch mainspring with bridle attached) Sorted by height, strength, and then length in MM.Also note the diameter of the spring in the ring shown in the pics in MM. If you have a question just ask. Select the spring you need from the drop down list above.All mainsprings in this listing are for auto wind watches.See my other listing for springs for manual wind watches.You get one spring per order.Ask questions before you order. Thank you for looking!
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