Tudor Factory Mainspring for caliber 59 & 65 movements - Steel

Tudor factory mainspring for 10½ ligne caliber 59 and 65 movements and quite likely others (likely the corresponding Rolex caliber), steel, new in envelope. These measure a metric 1.7 x 0.095 x ~340 mm. I specialize is 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.