BESTFIT Mainspring for SWISS 8-day Alarm / Car Clock 4.30mm x .25mm - T430-3

Bestfit System #77 Mainspring for SWISS 8-Day Car or Travel Clock, Dennison 34 x 0 x 48", No. T430-3, presumably the TIME side spring, regular Tongue end, steel, new in envelope. See images for precise mainspring specifications. I find these very infrequently so grab them when you can. I specialize in hard to find watch & clock parts and all parts are unconditionally guaranteed. Images do a pretty good job of representing the item