Service: Oris Alarm AS1930A2

Stefan from Germany sent me this watch for a service and a new crystal. It’s his father’s watch, and they call it “Sumsi” for obvious reasons.

It’s an alarm watch, so it has two springs, and a little hammer that knocks a pin on the case back when it’s time to get up. Oris used the AS1930 movement, which is a great little construction considering what had to be fitted in such a small space!

The top crown is for the alarm. In the pushed-in position, you wind the alarm spring. When pulled out, you can set the alarm and switch it on. Pushed in, the alarm won’t sound.

In this photo, you can see the little pin on the case back that gets hit by the hammer.

I remove the bezel to fit a new tension ring crystal.

The usual dirt under the bezel.

The bottom plate with the mechanism that triggers the alarm. The hour wheel can push into the alarm wheel every twelve hours, moving it slightly up, which released the alarm.

No lack of wire springs, levers, and wheels here!

Lovely movement – a tidy construction considering the complication.


With the wheel bridge removed, the gear train is visible. A properly jeweled fourth wheel for the central second.

At the top left (at 11 o’clock) you can see the hammer for the alarm.

Plates cleared and ready for cleaning.

With the balance jewels removed, I put the balance back on the top plate, and everything is ready for the cleaning machine. No lack of parts as you can see 😉

Time to turn my attention to the case. After thoroughly cleaning it, I press in the new tension ring crystal, and then press the bezel back on.

That looks better.

I put in a new mainspring for the going train, but leave the one for the alarm train.

I put the balance jewels back in, lightly oiling the cap jewel.

Apart from the two barrels, the top plate is relatively easy to put together – all the complex stuff for the alarm sits on the bottom plate.

Now it’s time for the complex bits. I start off by lubricating the centre wheel pivot before putting on the cannon pinion.

The alarm winding and setting gear goes in.

Four wire springs later, the bottom plate is back together.

The dial and hands are mounted. If you want to do this at home – you start off by putting the alarm hand wherever you want. Then turn the alarm setter to 12. Now turn the setting for the hands until the alarm sounds – voila, you got the 12 o’clock position for the hands. Now put on hour, minute and second hands, and you’re done.

Now the movement goes back into its case, and the case clamps are mounted. A new gasket for the case back, and we’re ready to do a final adjustment and close the back.

Admit it – you want one, too!

Definitely a watch I will want for my collection. Looks great, and with its alarm, something highly desirable.

9 thoughts on “Service: Oris Alarm AS1930A2

  1. Very interesting and very helpful, as for for no obvious reason the ‘Product Manual’ fails to mention the alarm…

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