Series 31E

Series 31E

Hand fine matt grounded stainless steel case with 42 mm diameter, finely decorated hand winding Unitas pocket watch movement modified to an indirect center second and a deep black contrast dial with handmade hour and minute hands. The new Model 31E is certainly one of the best pilot watches we've ever built.

Guinand Series 31E in full width

An extraordinary pilot watch

For our Series 31E we use a fully satinized i.e. by hand fine matt grounded stainless steel case with 42 mm diameter and 11.95 mm height and recase the HS81 manual wound movement in it. This watch is powered by the finely decorated hand winding Unitas pocket watch movement which is modified to an indirect center second and a special feature, which is visible only for the view of the wearer - the seconds zeroing.

 

 

To precisely set the time of a wrist watch most movements are equipped with a second stop – when the crown is wound, the second hand doesn’t move. The seconds zeroing is a much rarer design. When the crown is wound, the second hand continues to run until it reaches “60” and then it automatically stops – thus it is possible to use a time signal to set the watch to the second. 

Contemporary our model 31E is pressure-resistant up to 10 bar and equipped with sapphire glasses on front and back side. The watch wears a deep black contrast dial and handmade hour and minute hands. Like all the hour indices and the marking triangle, these steel pointers made in Saxony are coated with white luminescent material.

For the love of details

Also this watch was developed and built entirely in Germany - that is, Case, dial, hands, bracelet and clasp are all produced in Germany. The pocket watch movement we use is decorated, modified and regulated in our workshop in 5 positions. For this reason we engrave “Frankfurt” on the watch back.

Made in Germany

Technical details

Movement

  • Calibre HS 81
  • Base: UNITAS 6497 Lépine. Modified as per a construction by Helmut Sinn
  • Indirect center second
  • Second stop at 60 when crown is pulled
  • 18 jewels
  • 18000 vibrations per hour; 2.5 Hz.
  • Movement diameter 16 1/2‘‘‘ (36,6 mm)
  • Incabloc shock protection
  • Glucydur balance
  • Nivarox hairspring
  • Triovis precision adjustment system
  • Movement decorated with Geneva Stripes , blued screw hads, crown wheel and ratchet wheel with solar finish
  • Power reserve approx. 40 hours

Functions

  • Hours, minutes, indirect center second
  • Second stop at 60 when crown is pulled

Case

  • Stainless steel hand satinized
  • Sapphire crystal glass, domed, anti-reflective on the interior
  • Screwed back with sapphire crystal glass
  • Crown double sealed
  • Waterproof, vacuum resistant and pressure resistant up to 10 bar

Dimensions and Weight

  • Case diameter: 42 mm
  • Band lug width: 20 mm
  • Lug to lug distance: 50.9 mm
  • Distance between the spring bars: 46 mm
  • Case thickness: 12.35 mm
  • Weight without strap: 67 grams