Thomas from Belgium sent me his Movado Datron Diver Chronograph. It has the Zenith 3019 PHC movement, which beats at 36,000 bph.
The watch needs a service, so let’s get stuck in…
Yes, the amplitude is pretty feeble…
First look at the movement, and I can already see some abrasion.
The bottom plate looks nice and tidy.
Look at the specs of dirt on the chronograph bridge – this is abrasion, and usually comes from the auto winder.
Time to take the chronograph apart.
You can see the little specs of abrasion where the auto winder gears sit at 4 o’clock.
If you zoom in all the way on the large hole of the middle spring, you can see that it’s cracked – I only notice that when I put the movement back together.
The underside of the wheel bridge.
and the gear train.
Now it’s time to take the bottom plate apart.
The unlocking date spring is of the old type, and I will replace that with the new one, which is less likely to break.
Even though the barrel says “Do not open”, I do, and take out the mainspring for cleaning. The more Zenith chronograph movements I do, the more I am inclined to leave the old mainsprings in, as the movements have a problem with too much power on the winding gears anyway. So anything to alleviate that is welcome.
Into the cleaning machine.
The hour hand has lost its luminous compound, and I will re-apply new compound to both hands.
Everything ready for re-assembly.
The barrel is closed again, with the old mainspring greased.
The gear train goes back onto the plate, and all looks nice and clean.
The wheel bridge is on, and we are getting closer to a beating movement.
With the escape wheel cock and the balance in, the movement starts beating.
Now it’s time for the bottom plate.
The broken operating lever spring – no problem, as I can get hold of a new one.
The hammer also had a small crack, and I put in a new one. Good thing that I make photos available for my clients as I work on the watch, because Thomas spotted this straight away! I would only have noticed on re-assembly…
Now I can start to put the chronograph back together.
The old hammer with the little crack, and the new hammer still in its packaging.
All ready for the chronograph bridge.
And the chronograph bridge is on.
Now I can put together the rest of the bottom plate.
The old and new style unlocking date spring (old at the top).
Unlocking date spring in place.
Bottom plate complete.
Now the dial and hands go back on. The new luminous compound suits the watch quite well.
Now I case the movement, and only have to put in the oscillating weight.
And look at that – straight as an arrow, good amplitude, and low positional variation.Cased and ready to go back to Belgium.