<ul><li>This is a new size 16S mainspring #611 for a Hamilton watch</li><li>This mainspring is superior quality and leads the field</li><li>The edges are rounded to reduce friction in the barrel</li><li>It is oiled before going into the package and the wrapper is chemically tested to secure freedom from moisture</li><li>Dennisons of 19 1/2 x 4 x 21 1/4</li></ul><br><br>New Pocket Watch 16S Mainspring for Hamilton Pocket Watches This is a new size 16S mainspring #611 for a Hamilton watch This mainspring is superior quality and leads the field The edges are rounded to reduce friction in the barrel It is oiled before going into the package and the wrapper is chemically tested to secure freedom from moisture Dennisons of 19 1/2 x 4 x 21 1/4

Pocket Watch Mainspring #611 16 Size fits Hamilton