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, satin finish
  • sapphire crystal glass, anti-reflective on the interior
  • screwed back with sapphire crystal glass
  • Waterproof, vacuum resistant and pressure resistant up to 10 bars

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: 11.95 mm
  • Weight without strap: 67 Gramm

Watch configurator

Serie 31E

The Instrument Watch

Our Serie 31E is an instrumental manual winding watch with an indirect central second hand. The sapphire crystal directs the focus to the very readable face

Clasp
Price: -- €

incl. VAT, free shipping within Germany
For dispatch to countries outside the EU, VAT won't be charged.
VAT Refund when purchasing the watch directly in our sales plant.
Unless otherwise specified the delivery time within Germany is approx. 5-7 working days, 1-2 weeks abroad.
Kroko straps (reptile leather) cannot be shipped outside the EU

Straps 20 mm

Arizona

Leather Strap Arizona

Black Cowhide with alligator embossing, pin-clasp
folding-clasp available

Wrist size – strap length on Series 40

All wrist sizes are ca. dimensions, depending on your wearing habits
  middle hole outer hole inner hole
strap length incl. watch 190 mm / 7.5 inch 210 mm / 8.3 inch 170 mm / 6.7 inch

Colour variants

light brown
dark blue

Variants

Leather Strap Arizona Kontrast

cowhide with alligator embossing in black, cushioned, contrasting seam white, pin-clasp
folding-clasp available

Colour variant

dark brown

Montana

Leather Strap Montana

Armband Montana schwarz

Soft nappa leather in black, pin clasp
folding-clasp available

Wrist size – strap length on Series 40

All wrist sizes are ca. dimensions, depending on your wearing habits
  middle hole outer hole inner hole
strap length incl. watch 192 mm / 7.6 inch 211 mm / 8.3 inch 171 mm / 6.7 inch

Colour variant

Armband Montana Hellbraun
light brown

Variants

Leather Strap Montana Kontrast

Lederband Montana Kontrast Schwarz

soft nappa leather in black, cushioned, contrasting seam white, pin clasp
folding-clasp available

Colour variant

Leather Strap Montana Kontrast dark brown
dark brown

Kroko

Leather Strap Kroko

Leather Strap Kroko in black

Black alligator leather, pin-clasp

Wrist size – strap length on Series 40

All wrist sizes are ca. dimensions, depending on your wearing habits
  middle hole outer hole inner hole
strap length incl. watch 204 mm / 8 inch 225 mm / 8.9 inch 177 mm / 7 inch

Colour variants

Leather Strap Kroko in dark brown
dark brown

Kalbsleder

Leather Strap Kalbsleder

Leather Strap Kalbsleder in black

Black calfskin fine grained, contrasting seam white, pin-clasp

Wrist size – strap length on Series 40

All wrist sizes are ca. dimensions, depending on your wearing habits
  middle hole outer hole inner hole
strap length incl. watch 207 mm / 8.1 inch 219 mm / 8.6 inch 190 mm / 7.5 inch

Colour variant

Leather Strap Kalbsleder dark brown
dark brown

Rustikal

Leather Strap Rustikal

Leather Strap Rustikal black

Black cowhide with alligator embossing, cushioned, contrasting seam white, pin-clasp

Wrist size – strap length on Series 40

All wrist sizes are ca. dimensions, depending on your wearing habits
  middle hole outer hole inner hole
strap length incl. watch 200 mm / 7.9 inch 217 mm / 8.5 inch 181 mm / 7.1 inch

Colour variant

Leather Strap Rustikal mid-brown
mid-brown

Cordovan

Leather Strap Cordovan

Leather Strap Cordovan black

Black cordovan, cushioned, pin-clasp

Wrist size – strap length on Series 40

All wrist sizes are ca. dimensions, depending on your wearing habits
  middle hole outer hole inner hole
strap length incl. watch 189 mm / 7.4 inch 209 mm / 8.2 inch 166 mm / 6.5 inch

Colour variant

Cordovan cognac-colored
cognac-colored

Other Leather Straps

Leather Strap Antique

Leather Strap Antique

Pull up leather with laquered edging and colored stitch, pin-clasp
folding-clasp optionally

Leather Strap Outback

Leather Strap Outback

Worldwide first kangaroo nubuck leather-strap in serial production
Durable kangaroo nubuck leather strap, contrasting seam gray, pin-clasp
folding-clasp optionally

Leather Strap Outback Orange

Leather Strap Outback Orange

Worldwide first kangaroo nubuck leather-strap in serial production
Durable kangaroo nubuck leather strap, orange contrasting seam, pin-clasp 
folding-clasp optionally

Leather Strap Monza

Leather Strap Monza

 Dull finished calf leather with contrast stitching, BR-padded, pin-clasp

Leather Strap Rally

Leather Strap Rally

Soft cowhide leather with fine punching, pin-clasp

Leather Strap Vintage

Leather strap Vintage

Saddle leather with light contrast stitching, at tip of strap and at lug ends

Leather Strap Chronissimo

Leather Strap Chronissimo

Black cowhide, integrated in the case, pin-clasp

Wrist size – strap length on Series 40

All wrist sizes are ca. dimensions, depending on your wearing habits
  middle hole outer hole inner hole
strap length incl. watch 213 mm / 8.4 inch 232 mm / 9.1 inch 192 mm / 7.6 inch

Leather Strap Ozean

Leather Strap Ozean

Black shark fish leather, pin-clasp

Wrist size – strap length on Series 40

All wrist sizes are ca. dimensions, depending on your wearing habits
  middle hole outer hole inner hole
strap length incl. watch 192 mm / 7.6 inch 211 mm / 8.3 inch 172 mm / 6.8 inch

Leather Strap Pilot

Leather Strap Pilot

Black cowhide with "Bundeswehr" NSN coding

Wrist size – strap length on Series 40

All wrist sizes are ca. dimensions, depending on your wearing habits
  middle hole outer hole inner hole
strap length incl. watch 195 mm / 7.7 inch 221 mm / 8.7 inch 170 mm / 6.7 inch

Leather Strap Bali

Leather Strap Bali

White calfskin with alligator embossing, white seam, pin-clasp

Wrist size – strap length on Series 40

All wrist sizes are ca. dimensions, depending on your wearing habits
  middle hole outer hole inner hole
strap length incl. watch 199 mm / 7.8 inch 211 mm / 8.3 inch 181 mm / 7.1 inch

Rubber Straps

Rubber Strap Kroko

Rubber Strap Kroko

Black rubber with alligator embossing, contrasting seam white, pin-clasp

Wrist size – strap length on Series 40

All wrist sizes are ca. dimensions, depending on your wearing habits
  middle hole outer hole inner hole
strap length incl. watch 195 mm / 7.7 inch 216 mm / 8.5 inch 173 mm / 6.8 inch

Rubber Strap Profil 1

Rubber Strap Profil 1

Black rubber strap, surface with zigzag engraving on the surface and a folding-clasp

Rubber Strap Glatt

Rubber Strap Glatt

Black rubber strap, smooth surface, incl. a laser engraved folding-clasp satinated or bead-blasted

Clasp overview

Pin Clasps

Stainless steel pin clasps

Pin Clasp polished
Pin Clasp satinated
Pin Clasp bead-blasted
Pin Clasp PVD coated

Folding Clasps

Folding clasps

Folding clasp, stainless steel polished
Folding clasp, stainless steel bead-blasted
Folding Clasp Rubber Strap bead-blasted
Folding Clasp Rubber Strap satinated