Michael from Canada sent me this quite rare single-pusher Omega RCAF chronograph. It has the Lemania 2221 movement.
This is a great watch, and I especially like the white dial.
As you can already see on the photo, the central second hand doesn’t reset properly – and it doesn’t even always reset to the same position.
The pusher is crooked, and needs replacing.
The case back with the Royal Canadian Air Force markings.
The case back – it’s a 34/62.
A first glance at the Lemania 2221, which is marked as an Omega movement.
This is a single pusher movement, e.g. the same pusher is used to start, stop, and reset the chronograph.
The problem with the second hand not resetting properly is due to the tube being loose on the hand, so I carefully solder the tube onto the hand.
The movement also has a hacking second – important for military use, so that you can synchronize your watch properly.
The bottom plate is quite simple, as this movement doesn’t have an hour recorder.
Reassembly starts with the mainspring – as the old one is in very good shape, I clean, grease and re-use it.
Now comes the fun part.
I put the balance jewels in and test them – the balance swings freely, and takes a long time to come to a halt.
Then I put the gear train in, and oil it.
The bottom plate is back together.
And we have a result. The beat error is collet adjusted, so 1.0 is great, and I will leave it at that.
Once the base movement is back together and tested, I can put the chronograph layer on.
The chronograph is back on, and I adjust the depthing, and test everything.
Now the hands go back on.
The new pusher is too long, and I shorten it.
I also put on a new crown that is a bit chunkier. Unfortunately, as the winding stem is tap 11, there is very little choice of crowns.
The crystal that was fitted was just a simple tension ring crystal, which is wrong. The crystal is stepped, and pushed in from the inside, where the step rests against a step in the case. There is no original Omega crystal available, so I modify a standard crystal by turning a step into it.Back together, and looking great!