HR Mainspring No. 725 for Beguelin caliber 9 & Unitas calber 431 Pocket Watch - Steel

HR Mainspring No. 725 for 19 ligne Beguelin caliber 9 and 18½ ligne Unitas caliber 431 pocket watch movements, plus perhaps similar ébauche watches (someone suggested a 12s Wittnauer), steel, new in faded & frail 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.