Hermle FHS Barrel #31 Backwind comes complete with Mainspring CP-M1206H. This Barrel has a backwind threaded arbor. All FHS Barrels are stamped with a number right on the barrel making it super easy for you to reorder! This number 31 Backwind barrel fits Hermle movement FHS 130-627 strike side.

Measurements: All in mm

Diameter of the barrel at teeth	39.6
Number of teeth	70
Diameter of barrel casing	36.5
Height of barrel	15