BESTFIT Mainspring 164Z for Unitas 429 based 16s Waltham B-16 Movements - Alloy

BESTFIT Mainspring 164Z for Swiss made Waltham B-16 grade movements based on the Unitas caliber 429 open face 17j, tongue end, white alloy, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.