Feinwerkbau Mod. 300S Main Spring Set #1700.129.2

2x Genuine Feinwerkbau Main Spring ( 1700.129.3 & 1709.129.3)

Now include part #1700.124.3 Slide ring (goes between the two springs)

Spring specs:

- 14 1/2 coils (each)

O.D. 20.25mm/.798 inch

I.D. 14.8mm / 0.582 inch

Lenght: 110mm / 4.334 inch (each)

Spring are coiled in opposite direction

Seals kit are available in my other listing.