This Glashutte Original Calendar and Moonphase watch is an extremely elegant watch, full of functionalities, and ready to wear in any situation. As all Glashutte a methiculous attention has been placed to the details and the watch is a pleasure for the eye to look at with a very detailed and balanced dial and an even more eye-catching see-through back. Please look carefully at all the pictures as those are part of the watch description. You can also see a video of the watch here: https://youtu.be/-hVhT0lkFvw Watch summary: Glassütte Original 10006130204, 100-06-13-02-04, Senator Calendar Moon, Reset Function, Day, Month, Panorama Date and Moon Phase, Center Seconds, Stainless Steel on a Strap with a Stainless Steel Double-Foldover Buckle, Automatic Movement Caliber 100-06, Display Back, Diameter: 40.1 mm, Thickness: 13mm, Silver Dial with Applied Silver Index Numerals, Sapphire Crystal, Water Resistant to 5 atm, Box, Manual and Glassütte CD-Rom. More about this watch: This is a stainless steel Glashutte Original Senator Calendar Moon 100-06-13-02-04. It has an alligator leather strap with a stainless steel double fold over buckle, and a scratch resistant sapphire crystal. It has an exhibition screwed-down sapphire display case back secured with 5 screws. The 40.1mm diameter solid three body case, stepped inclined bezel, and curved lugs are polished, and there are 4 inset calendar adjusters in the band. The dial is grained silver with applied silver baton hour index markers, luminous silver sword hands, a center sweep seconds hand, and an outer minute/second track. There is a large date aperture window at the 4 o'clock position, and a moon phase subsidiary dial between 7 and 8 o'clock. A day sub dial is at 11 o'clock, and there is a month indicator at 2 o'clock. It's water resistant to 50 meters/165 feet, and it has a power reserve of 55 hours. The 13mm thick case, dial, and movement are all signed. This Glashutte Original Senator Calendar Moon 100-06-13-02-04 has a mechanical automatic self-winding Glashutte Original Caliber 100-06 movement. It's rhodium plated, with a divided Glashütte three-quarter plate with striped/ribbed embellishment, some hand engraved designs, and beveled component edges. It's constructed with 55 jewels, a shock absorber mechanism, blued screws, and a straight-line lever escapement. It has a monometallic balance adjusted to 5 positions, a self-compensating flat balance spring, a swan-neck regulator, and a 21K gold segment rotor. It includes intelligent winding with a bi-directional winding rotor, a 21K gold oscillation weight, and the mechanism beats at a frequency of 28,800 vph (4Hz).