This Omega 2416 came in a batch of watches to look at. It didn’t run, it was dirty and the crystal was in a terrible shape.

The movement is an Omega 28SC. It has an indirect sweep second. The concept wasn’t that successful as it had a few problems. The second hand would often stutter as it’s not in the direct flow of power from the gear train. Also, it adds an extra layer to the movement, resulting in a thicker movement. This movement still lasted for 6 years, though. After the movement was relisted as the 370 they probably used it for another few years.

It’s possible to look up the serial number on the charts available on the internet. The charts tell you that this particular serial number is from 1943. However, several sources state that the 28SC is in production since 1944. It must be one of the very first ones then.

For more info, here is an article about how to date your watch and this is an article on how to authenticate an Omega.

Disassembly

The one thing that I immediately notice is the escape wheel bearing jewel. It’s completely topped off with old and gummy lubrication. You can’t even see the escape wheel pinion.

That will stop your watch or cause serious problems at least.

Omega 2416

The escape wheel bearing jewel completely flooded with oil

Remove the power from the mainspring. Lift the balance and the pallets. Then flip the movement to remove the hour wheel and the cannon pinion.

Because the movement doesn’t have a shock protection the balance has to be disassembled further.

The balance complete can be cleaned by dipping it into One-Dip or something similar. All other parts (balance cock, jewel hole, capstone and regulator) can be cleaned in the watch cleaning machine.

Omega 2416

The balance and the pallets removed

Lift the sweep second cock and the sweep second pinion. Then remove the driving wheel over the 3rd wheel.

You have to use a special tool for removing wheels with 5 spokes. I’ve read that you can also use 2 small screwdrivers but I wouldn’t recommend that. The risk of damaging the 3rd wheel pinion or scratching the train wheel bridge is too high.

Remove the train wheel bridge and lift the gear train. Except for the center wheel because that is covered by the barrel bridge.

Omega 2416

The gear train lifted and also the crown wheel and the ratchet wheel have been removed

Lift the barrel bridge and then remove the center wheel and the main barrel.

Omega 2416

This side of the movement is picked clean

Flip the movement and remove the set lever spring. Then remove the motion works and the keyless works.

Omega 2416

The dial side of the movement is completely empty

Remember to pre-clean the movement and some parts with a pegwood. Don’t forget the pallet stones and the pallet horn.

Clean all parts in the watch cleaning machine.

Assembly

Start with the main barrel and the gear train. Refit the train wheel bridge.

Omega 2416

The main barrel, gear train and wheel train bridge installed

Reinstall the barrel bridge, the crown wheel and the ratchet wheel. Then you can refit the sweep second pinion and the sweep second cock.

Be careful with replacing the driving wheel. You can use a handfitting tool or one of the flat stakes from the staking set. Don’t press down until you’re sure that the driving wheel lines up with the sweep second pinion.

Try to install the driving wheel as true as possible. The sweep second pinion is not that thick and you don’t want the wheel to touch the train wheel bridge.

Omega 2416

The barrel bridge with the ratchet wheel and the crown wheel reinstalled. I also refitted the sweep second assembly

Flip the movement to reinstall the motion works and the keyless works.

Omega 2416

The motion works and the keyless works refitted

Flip the movement back to reinstall the pallets and the balance. Don’t forget to oil the balance endstone before you reassemble the balance.

Omega 2416

The 28SC movement after a good cleaning and fresh lubrication

Refit the dial and the hands and recase it. I also polished the crystal while the parts were in the watch cleaning machine.

Omega 2416

This Omega 2416 is a beautiful vintage timepiece again

What do you think of this 40s Omega? Let me know in the comments below.

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Founder & editor of WahaWatches. I’ve been collecting watches for years. My favorite part is to pull them to bits.

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