Service: Türler With An MST 360 Movement

 In Watchmaking

This is one of Michał’s watches. A 1948 Roamer with an MST 360 movement with a signed Türler dial.

The MST 360 is an unusual movement:

  • The click and the click spring are on the bottom side of the movement.
  • The barrel has an extra winding wheel at the bottom side.
  • The keyless works are missing a castle wheel, but it has an extra intermediate wheel and a bottom crown wheel.
  • The return bar doubles as a cover plate, but it’s missing the check spring.

Türler still exists (Zürich – Switzerland) and is one of the oldest privately owned businesses in the watch retail and jewellery trade.

It had suddenly stopped running and would wind forever without building up resistance and the lume in the minute hand was severely damaged. A chunk of it was actually missing.

Here we go.

Disassembly

Remove all power from the mainspring as usual. Move the click away from the ratchet wheel and slowly let the crown slip between your thumb and index finger.

Remove the balance assembly, the pallet cock, and the pallets. I always store them upside down in a tray underneath a dust cover.

The balance assembly, the pallet cock, and the pallets removed.

Remove the ratchet wheel and the crown wheel with the bushing. Lift the barrel bridge.

The ratchet wheel, the crown wheel with the bushing, and the barrel bridge removed.

Remove the barrel and the train bridge to gain access to the wheel train. Remember to lift the train bridge straight up to avoid any damage to the wheel pivots.

It looks like the wheel train bridge and the escape wheel cock are two separate parts, but it’s one part.

The barrel and the wheel train bridge removed.

Open the barrel to check the mainspring. Use a brass or bronze set of tweezers and use your thumb nails to press down on the main wheel of the barrel.

As expected, the mainspring was broken with the end piece still attached to the barrel arbor. So, I ordered a new one.

A broken mainspring with the end piece still attached to the barrel arbor.

The usual way to remove wheels is to start with the uppermost one and work your way down. So, lift the center wheel, the third wheel, the fourth wheel, and finally the escape wheel.

The top plate of the movement completely empty.

Flip the movement around and start with the bottom plate.

You can clearly see the click and the click spring on this side of the movement. It has an unusual return bar that rocks back and forth between the winding and setting position.

Remove the click and the click spring.

Lift the minute wheel and remove the return bar with the setting wheel, the intermediate wheel, and the bottom crown wheel.

Don’t forget the pull out piece with its screw and the bottom balance end piece.

Clean all the parts in the watch cleaning machine.

Assembly

First, replace the bottom balance end piece. Don’t forget to lubricate the endstone.

Flip the movement around to fit the pull out piece with its screw.

Barrel MST 360 with extra winding wheel
This is the barrel with the new mainspring and the extra bottom winding wheel.

Place the barrel in position and reinstall the escape wheel, the fourth wheel, the third wheel, and the center wheel and place the wheel bridge in position.

The barrel, the wheel train, and the wheel bridge reinstalled.

Install the barrel bridge and place the crown wheel with the bushing and the ratchet wheel in position.

The barrel bridge, the ratchet wheel, and the crown wheel with the bushing reinstalled.

Turn the movement around and reinstall the motion works and the keyless works.

MST 360 bottom plate
All parts on the bottom plate are reinstalled. The minute wheel, the hour wheel, and the dial washer will fall off if you flip the movement around, but this gives you an idea how it looks fully reassembled.

Flip the movement to the top plate and reinstall the pallets. Wind the watch a couple of times to check the pallet fork. It should snap to the other side with the lightest touch.

Place the balance in position and the movement should come alive.

The index is almost all the way to the “Fast” direction. An index that’s slap bang in the middle looks better and is also easier to regulate in the future, but it is what it is. As long as it’s still on the balance cock and it keeps time, it’s alright.

Place the hour wheel and washer in position and fit the dial.

As I mentioned, the original lume was severely damaged, so Michał and I decided that the hands should be relumed.

As you can see in the picture above, the lume on the dial was probably light green. Over time it has changed into a shade of dark greyish green.

So, I mixed a green with dark grey and tried to match the color on the dial as good as possible.

These are the hands after the second layer of new lume.

I also fitted a new crystal because the old one was too small and didn’t fit right.

1948 Türler with MST 360 movement

What do you think of this Türler watch? Do you have a similar one? Let me know in the comments below.

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Showing 2 comments
  • Avatar
    Chayal M L
    Reply

    As informative and useful as always,
    Thanks Melvin.
    Chayal

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