Balance Spiral – UNITAS 520 5¼" Anchor [NOS] 1 Piece – Hairspring

New stock balance spring for UNITAS 520 caliber, lever escapement, size 5¼ lignes.

Spiral from old stock. Photos are for illustrative purposes only: the balance wheel received may differ visually from the illustration (with or without adjusting screws, metal color may vary). Only the caliber and reference number indicated in the title guarantee compatibility. Delicate part, handle with care.

Sold individually (unless otherwise stated in the title) · NOS · May show signs of age · Photos are representative

Origin

These parts may come from different suppliers and stocks depending on availability. Regardless of their origin, excellent quality is guaranteed; each item is carefully selected before being offered for sale.