Dan Henry 1945 WWII Chronograph instructions

Dan Henry 1945 WWII Chronograph: User Guide

Congratulations for purchasing your Dan Henry 1945 WWII Chronograph.  
Your timepiece is equipped with a Miyota caliber 6S20 60-minute chronograph with a smooth-motion center second hand and 1/10-second sub-dial.

1. Setting the time:

  • Pull out the crown to the second click position.
  • Turn the crown to set the hour and minute hand.
  • Push in the crown to the normal position.

2. Setting the date (for watches with date windows)

  • Pull out the crown to the first click position.
  • Turn the crown clockwise to set the date.

Note: Do not change the date when the hands are set between 9 PM and 3 AM, because the day may not change properly. To set the date during that time, first change the hands to a time outside of that range; set the date, and then reset the correct time.

3. Using the chronograph

The stopwatch function on your Dan Henry 1945 WWII Chronograph measures minutes, seconds, and 1/10 seconds for up to 60 minutes.


The large second-hand in the center of the watch shows elapsed seconds while timing. The sub-dial in the right position shows 1/10-seconds, and the sub-dial in the left position shows recorded minutes.
The sub-dial in the lower position shows seconds, and runs continuously.

  • To start the chronograph: press the upper pusher.
  • To stop the chronograph: press the upper pusher again.
  • To reset the chronograph: press the lower pusher. All of the chronograph hands will reset to the zero position.

When timing, the right sub-dial measuring 1/10 seconds will spin for 30 seconds; the decimal hand will then stop to conserve the battery, while timing continues inside the movement. When you press the lower pusher, the decimal hand will move to show the elapsed 1/10 seconds.
The Dan Henry 1945 is a 60-minute chronograph, so the stopwatch functions will stop after one hour.

4. Using the 12-hour GMT Bezel

The Dan Henry 1945 Chronograph is equipped with a rotating 12-hour GMT bezel, so you can view a second time zone. For example, to monitor the time in a city that is five hours ahead of you, turn the bezel counter-clockwise for five clicks or five hours, and read the hours of the second time zone in the bezel.

5. Measurement scales

The Telemeter scale determines the distance from the wearer to an event that can be both seen and heard.
For example, how far away is a lightning storm? Start the chronograph timer when you see a lightning flash, stop the timer when you hear the thunder. Read the distance in miles or kilometers on the telemeter scale.

The Tachymeter scale computes speed based on travel time. The tachymeter can also be used to measure distance based on speed.
To measure speed:

  • To use the tachymeter for measuring speed: start the chronograph at the beginning of a 1-kilometer or 1-mile distance. At the end of the distance, the second-hand points to indicate your speed.
  • To measure distance: while traveling at a constant speed, start the chronograph at the beginning of the length to be measured. When the second-hand reaches the point on the tachymeter scale that equals the speed of the vehicle, one unit of distance has been covered (miles if speed is miles per hour, kilometers if kilometers per hour). For example, if you travel at a constant 80 mph (or at 80 km/h), then the distance traveled while the second-hand moves to "80" (45 seconds) will be 1 mile at 80 mph, or 1 kilometer at 80 km/h.


6. Resetting the chronograph hands

If the central seconds hand or the sub-dial hands do not return to zero, reset them like this:

  • Pull out the crown to the second position.
  • To adjust the central seconds hand: press the upper pusher once to set the chronograph second hand to the zero position.
  • To adjust the right sub-dial hand: repeat the procedure described above, but use the lower pusher.
  • The sub-dial hands can be advanced rapidly by continuously pressing the pusher.
  • When the chronograph hands have been reset, then reset the time and push in the crown to its normal position.


7. Water resistance

  • Your chronograph has been tested for water resistance. It is safe for wear in a swimming pool, but not for scuba or ocean diving.
  • The crown must be pushed in completely to ensure that the watch is water resistant.
  • Do not wear your watch in a bath, shower or sauna; soap dries out the rubber seals, and your watch may loose its water resistance.

8. Accuracy and battery replacement

  • The accuracy of the movement is 20 seconds a month.
  • With normal use, the battery should last about three years.
  • When the watch begins to run slow, the battery should be changed. Use a ref. SR927W or 395 battery.
  • Battery life may be shortened by extreme heat or cold.
  • Battery life can be conserved when not using the watch by pulling out the crown, which will stop the watch.

9. Care for your watch

  • Clean your watch with a soft brush or cloth. To remove dirt, use a slightly damp cloth.
  • Never use abrasives such as polish paste or polishing paste.
  • A watch with hands should not be worn for sports. Even low-impact sports such as baseball, golf, and tennis can misalign the hands or damage their movement. Instead, wear a shock-resistant digital watch.
  • Do not leave your watch exposed to the direct sun inside a car.  
  • To charge the glowing lume in the hands and hour markers, hold the watch face close to a light source for 10 seconds.
  • Keep your watch at least several inches away from magnetic fields such as speakers and battery chargers. Magnetic sources can reduce the accuracy of your watch.

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