Time for one of Anders’ watches again, and this time it’s a Hamilton Chronograph with the Lemania 5100 movement.
The feature list of this movement is a long one:
- central second and minute recorder
- hour recorder
- sub second hand
- quick-set day and date
So quite a comprehensive list of features, and, on top of that, it’s a military grade movement that can withstand large shocks without the chronograph stopping. All that puts the movement high up on the top list of chronograph movements.
But, there is a downside to all this as well, and we will get to that further down.
Performance is pretty bad, so it’s definitely time for a service.
The two grey nylon blocks hint at the extensive use of the stuff.
No less than 7 hands.
The movement is constructed of simple gauge plate type plates, that have a minimum amount of machining done to them, and pillars. That does remind me of the cheap pin pallet movements of the 60s…
The barrel can be removed without taking the movement apart, by pulling the central arbor (at 11.30 o’clock) out.
The wheel / barrel bridge removed.
The movement is in very good condition, with the nylon parts pristine. Above the balance is the vertical clutch / fourth wheel that drives the chronograph components on the other side of the plate. This is the same clutch construction that Seiko uses in their chronographs, and it’s what gives this movement its excellent shock protection.
Here is the vertical clutch, and half of it is nylon, too, which will add to the capability to absorb huge shocks.
The plate with the hammer at 2 o’clock.
The bottom plate has a day and date disc.
The tube of the sub-hand got stuck on its arbor, and I carefully have to remove it.
No lack of nylon here, either.
The plate covering the chronograph mechanism is of clear plastic.
It’s important not to put this stuff into the cleaning machine. The nylon is fine, but the clear plastic will turn milky if put into the cleaning fluid.
The chronograph mechanism is made of fairly easy to machine parts.
All the parts are cleaned and ready to be put back together.
I start on the bottom plate, so that I can fit the central chronograph second runner.
Now the gear train goes in.
And I’m ready for the bridge.
The bridge is on, and the movement is beating.
Very nice performance, so nothing to complain about here.
The chronograph layer is back in.
And the day and date disc are back on.
With the auto winder oscillating weight put on (the auto winder is unidirectional), the movement is ready for casing.
Anders supplied a new dial and hands (Lemania branded).
The hands are on, bur Anders wants a darker lume colour.
Here we go!Cased and ready for action!
For me, the advantages of this movement outweigh the downsides. Whatever you make of it, it’s a very interesting construction, and a good piece for any collector.