Lot of 2 Hamilton Dynavar Mainspring for 21/0s Nos. 46431 & 46432 - Alloy

Lot of 2 Hamilton Factory Dynavar Mainspring for 21/0s Movements, Catalog Nos. 46431 & 46432, alloy, new in envelope. Made for Grades 750 & 751, and perhaps others. See image for precise characteristics. Images do a pretty good job of representing the item.