Hamilton Dynavar 20/0s & 21/0 Mainspring No. 717531 - Alloy

Hamilton Dynavar Mainspring for 14/0s Grade 721, 995, 995A, 997 Movements, Factory No. 717531, alloy, new in envelope. A newer generic repackaging of what is most certainly an original factory 717531, correctly marked as fitting the grade 995A (and others). I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.