100-02-25-12-53Ref

The Glashütte Original Senator Perpetual Calendar unites a complicated movement with a serene appearance. The caliber 100-02 powers the perpetual calendar indications, all visible through dial apertures, including the 'big date' and the leap year indicator below the 12 o'clock logo. Reference 100-02-25-12-06 comes with a rubber strap and pin buckle, 100-02-25-12-04 features a rubber strap and folding clasp, and 100-02-25-12-53 includes a rubber strap and short folding clasp.