The Glashütte Original Senator Perpetual Calendar is a stunning timepiece that combines a complex movement with a simple and elegant design. Its caliber 100-02 movement powers various features, such as the 'big date' window and leap year indicator, which are beautifully displayed through apertures on the dial. The watch comes in three variations, all featuring an alligator strap. The only difference lies in the buckle or clasp option: pin buckle for reference 100-02-22-12-01, folding clasp for reference 100-02-22-12-05, and short folding clasp for reference 100-02-22-12-50.