Service: LIP Dress Watch with DUROWE 7425 Movement

 In Watchmaking

Another French watch on the workbench.

This time it’s a LIP from the 1970s. The funny thing is that it doesn’t have an in-house movement. It’s not even French.

It’s a DUROWE/INT 7425 with a quickset date function and Duro-Swing shock protection system.

ETA bought DUROWE in 1965 to gain access to the European market and brought the focus back to making movements. This could be one of the last DUROWE movements because they fell victim to the quartz crisis in the late 1970s, like so many others.

As you can see, the watch had a broken winding stem and a battered crystal but otherwise seemed to be in good condition.

There we go!

Disassembly

As always, remove all power from the mainspring before you start working on the movement. This is to prevent damaging the escapement while working on the wheel train.

Usually, you’d let the crown slip between your thumb and index finger while moving the click away from the ratchet wheel. Since the winding stem with the crown is broken, that’s impossible. Use a screwdriver on the ratchet wheel screw to let down the power. Be careful not to let the screwdriver slip because you could damage the mainspring.

Move the click with a sharp peg wood or a watchmaker’s pick. If you can’t move the click, you’ll have to hold down the power with a screwdriver and remove the click with the click spring.

Remove the balance and the pallet fork with the pallet cock and store them somewhere safe.

LIP with DUROWE 7425 movement

Balance and pallet fork removed.

This movement has a calendar, so this is a good time to flip the movement around and start with the calendar works.

LIP with DUROWE 7425 movement

The bottom plate with the calendar works.

Unscrew the four screws and lift the cover plate. Carefully release the tension from the date jumper spring and lift the date jumper and its spring. Remove the date ring.

Lift the hour wheel and the cannon pinion.

LIP with DUROWE 7425 movement

The cover plate, date jumper with its spring, date ring, hour wheel, and cannon pinion removed.

Lift the double date setting wheel, the unlocking yoke for the date ring with its spring, and the unlocking yoke cam with the driving wheel.

Remove the minute wheel and the keyless works.

LIP with DUROWE 7425 movement.

The bottom plate empty.

Time to flip the movement to the top plate.

Remove the ratchet wheel and the crown wheel with its ring. The crown wheel screw has three grooves, so it’s left-handed. Righty loosey, lefty tighty in this case!

Lift the wheel-train bridge to gain access to the wheel train. Remove the escape wheel, the third wheel, and the sweep seconds wheel.

LIP with DUROWE 7425 movement

Remove the barrel bridge and lift the barrel.

LIP with DUROWE 7425 movement

The click and the click spring are one part in this movement, and it’s secured on the underside of the barrel bridge.

Remove the center wheel cock and lift the center wheel.

LIP with DUROWE 7425 movement

Pre-clean the pivot holes and bearing jewels with a peg wood.

Clean all the parts in the watch cleaning machine.

Assembly

Place the center wheel, the center wheel cock and the barrel back into place.

Fit the escape wheel, the third wheel, the sweep second wheel and reinstall the wheel-train bridge.

LIP with DUROWE 7425 movement

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

Reinstall the barrel bridge (with the click/click spring installed at the underside), the ratchet wheel, and the crown wheel with its ring.

LIP with DUROWE 7425 movement

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

Turn the movement around. Reinstall the keyless works, the minute wheel, and the cannon pinion. I fitted a new winding stem that I trimmed to the correct size after I cased the movement.

LIP with DUROWE 7425 movement

The keyless works (with the multipurpose setting wheel and mounted set lever), minute wheel, and the cannon pinion reinstalled.

Reinstall the unlocking yoke cam with the driving wheel, the unlocking yoke for the date ring with its spring, and the double date setting wheel.

Place the date ring and reinstall the date jumper with its spring.

LIP with DUROWE 7425 movement

The unlocking yoke cam with the driving wheel, the unlocking yoke for the date ring with its spring, the double date setting wheel, the date ring, and the date jumper with the spring reinstalled. Make sure that you correctly install the double date setting wheel with the hook around the little post. I didn’t, and it was in front of one of the screw holes for the cover plate.

As you can see, the unlocking yoke for the date ring isn’t engaged yet. I suggest that you do that after you’ve replaced the cover plate and screwed it down as much as possible. If you don’t, there’s a good chance that the date jumper and the spring keep pinging across the bench.

So, place the cover plate in position and engage the unlocking yoke with the date ring just before you screw it all the way down.

Turn the movement back around and fit the pallet fork and the pallet cock. Give the crown a few spins and test if the pallet fork snaps to the next position with the lightest touch.

Place the balance in position, and it should come alive immediately.

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

When the watch has a date function, it’s essential that the date changes precisely at 0:00. Pull out the crown and set the time forward until the date jumps to the next date. Fit the hands in the 12 o’clock position.

I fitted a new crystal because the old one was too far gone to be polished.

LIP with DUROWE 7425 movement

This watch is an excellent example that with some TLC, you can still find a nice watch from a respected brand in good condition for less than $50.

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

Recommended Posts
Showing 6 comments
  • Avatar
    Clive
    Reply

    Very interesting article. I really enjoyed reading it.

  • Avatar
    Brian W
    Reply

    Beautifully photographed and explained. I like that you feature fine watches that are accessible (affordable) to non-millionaires. Thanks for putting together, and sharing, a nice watch site. Cheers.

    • Melvin Hollenberg
      Melvin Hollenberg
      Reply

      Thanks for the wonderful words. Affordable mechanical watches is exactly what we focus on.

  • Avatar
    H.d.r. Pootjes
    Reply

    I am reading this in excitement and learned a lot
    Thanks

Leave a Comment

Happy New Year 2019What is AR coating?