This auction is for one (1) vintage Hamilton watch Mainspring part for the 20/0 or 21/0 size Hamilton vintage pocket grades watch models. Rare old stock watch part out of a Swiss watchmaker's parts stash. Blued steel type spring that needs to be wound in a mainspring winder to install it. Comes from the parts envelope shown but will be sent to you in a generic parts envelope.

SEE THE SQUINKY COMPLETE HAMILTON PARTS SELECTION: Look in our other auctions for more vintage Hamilton watch part sales if you need a balance staff mainspring winding stem crown balance jewel or other common Hamilton watch part for Hamilton wristwatches or pocket watches. Buy with confidence from a seller with more than 17,000 positive feedbacks and history on EBAY since 1998.