VIGOR Clock Mainspring for Junghans J66 Alarm No. T310.1

VIGOR Clock Mainspring for Junghans caliber J66 Alarm clocks, ALARM side spring, Regular tongue end, No. T310.1, steel, new in envelope. See images for precise mainspring specifications. I specialize is hard to find watch & clock parts and all parts are unconditionally guaranteed. Images do a pretty good job of representing the item