Series 31 Classic
What goes best with an elegant outfit? A three-hand watch in a round, polished case!
The engine-turned face and the pocket watch movement that has been redesigned to feature an indirect central second hand make this watch an elegant choice. A key feature of the movement remains the secret of the wearer – the second stop.
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 second stop 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.
Model Overview Series 31 Classic
31.HS-20
Case
stainless steel polished, case sides in satin finish
Dial and Hands
Guilloché, silver electroplated dial, applied rhodium-plated numbers
Functions
Hours, minutes, indirect center second, second stop at 60 when crown is pulled
31.HS-30G
Case
stainless steel polished, case sides in satin finish
Dial and Hands
Guilloché, dial silver/gray electroplated, applied golden colored indexes/numbers andgolden colored hands, indexes and hands coated with black luminous colour
Functions
Hours, minutes, indirect center second, second stop at 60 when crown is pulled, date indication at 6 o'clock
31.HS-32G
Case
stainless steel, black chromated
Dial and Hands
Guilloché, dial silver/gray electroplated, applied golden colored indexes, golden colored hands, indexes and hands coated with black luminous colour
Functions
Hours, minutes, indirect center second, second stop at 60 when crown is pulled, date indication at 6 o'clock
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
- 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
- Case made of stainless steel, polished
- sapphire crystal glass, anti-reflective on the interior
- screwed back with crystal glass
- Pressure resistant up to 10 bar
Dimensions and Weight
- Case diameter: 41,9 mm
- Case thickness: 13,7 mm
- Band lug width: 22 mm
- Weight without strap: 71 Gramm
Straps 22 mm
Leather Strap Arizona
Black Cowhide with alligator embossing.
Available with a pin or folding clasp.
| Cases 22 mm | Type 42 | Type 31 |
|---|---|---|
| ideal wrist circumference in mm | 192,3 mm | 191 mm |
| ideal wrist circumference in inch | 7.6 in | 7.5 in |
| max. wrist circumference in mm | 212,3 mm | 211 mm |
| max. wrist circumference in inch | 8.4 in | 8.3 in |
| min. wrist circumference in mm | 172,3 mm | 171 mm |
| min. wrist circumference in inch | 6.8 in | 6.7 in |
Wrist circumference specifications are approx. values and depend on the individual wearing habits.
Leather Strap Monza
Dull finished calf leather with contrast stitching, BR-padded
Available with a pin or folding clasp.
| Cases 22 mm | Type 42 | Type 31 |
|---|---|---|
| ideal wrist circumference in mm | 187,3 mm | 186 mm |
| ideal wrist circumference in inch | 7.4 in | 7.3 in |
| max. wrist circumference in mm | 207,3 mm | 206 mm |
| max. wrist circumference in inch | 8.2 in | 8.1 in |
| min. wrist circumference in mm | 169,3 mm | 168 mm |
| min. wrist circumference in inch | 6.7 in | 6.6 in |
Wrist circumference specifications are approx. values and depend on the individual wearing habits.
Leather Strap Starfighter Pilot
Black leather strap made of intensely grained cow hide with a subtle contrast stitching.
Available with a pin or folding clasp.
| Cases 22 mm | Type 42 | Type 31 |
|---|---|---|
| ideal wrist circumference in mm | 195,3 mm | 194 mm |
| ideal wrist circumference in inch | 7.7 in | 7.6 in |
| max. wrist circumference in mm | 213,3 mm | 212 mm |
| max. wrist circumference in inch | 8.4 in | 8.3 in |
| min. wrist circumference in mm | 176,3 mm | 175 mm |
| min. wrist circumference in inch | 6.9 in | 6.9 in |
Wrist circumference specifications are approx. values and depend on the individual wearing habits.
Leather Strap Vintage Black
High-quality leather strap with red stitching, at the tip of the strap and at lug ends
Leather uppers, matte; Underside leather both cowhide. The thickness of the strap is approx. 3,3 mm.
Available with a pin or folding clasp.
| Cases 22 mm | Type 42 | Type 31 |
|---|---|---|
| ideal wrist circumference in mm | 200,3 mm | 199 mm |
| ideal wrist circumference in inch | 7.9 in | 7.8 in |
| max. wrist circumference in mm | 215,3 mm | 214 mm |
| max. wrist circumference in inch | 8.5 in | 8.4 in |
| min. wrist circumference in mm | 181,3 mm | 180 mm |
| min. wrist circumference in inch | 7.1 in | 7.1 in |
Wrist circumference specifications are approx. values and depend on the individual wearing habits.
Leather Strap Antique
Pull up leather with laquered edging and colored stitch.
Available with a pin or folding clasp.
| Cases 22 mm | Type 42 | Type 31 |
|---|---|---|
| ideal wrist circumference in mm | 193,3 mm | 192 mm |
| ideal wrist circumference in inch | 7.6 in | 7.6 in |
| max. wrist circumference in mm | 213,3 mm | 212 mm |
| max. wrist circumference in inch | 8.4 in | 8.3 in |
| min. wrist circumference in mm | 171,3 mm | 170 mm |
| min. wrist circumference in inch | 6.7 in | 6.7 in |
Wrist circumference specifications are approx. values and depend on the individual wearing habits.
Rubber Strap Glatt
Black rubber strap, smooth surface, incl. a laser engraved folding-clasp satinated or bead-blasted.
Available with a pin or folding clasp.