A Schild – AS Calibre 1906 – Part No. 770 Mainspring (NOS) Related posts: A Schild – AS Calibre 1906 – Part No. 100 plate (NOS) A Schild – AS Calibre 1906 – Part No. 425 Click (NOS) A Schild – AS Calibre 1906 Watch Mainspring NOS.