Selita SW 300-1 COSC

Watch Interest · Jul 10, 2025

Good morning everyone.

I have been contemplating getting a watch with SW300 COSC.

I was put off when I came across a watchmaker on utube repairing an SW200 with the known common anbd reoccurring issue relating to the ratchet wheel that has teeth break off when manually winding the movement. The watch maker made a point of mentioning the SW200-1 he had in for repair was the newer revised movement that Selita had claimed had fixed the issue.

Has this manually winding issue also applied to the SW300? Any other reoccurring issues with the SW300 I should know about?

Any help from members or watchmakers familiar with the SW200-1 and SW300-1 COSC would be greatly appreciated.

Thanks

Pavlos

Knebo · Jul 10, 2025

The SW200 is a clone of the ETA 2824 and the SW300 is a clone of the ETA 2892. These are some of the most robust and reliable movements around. I haven't heard about ratchet wheel issues on the SW300 / ETA 2892.

Go for it and don't worry!

Still, generally, these movements are better wound my the automatic winding mechanism. If it has stopped, just wind a little bit by hand/manually to get it going. Then let the automatic winding do the rest.

Watch Interest · Jul 10, 2025

Knebo
The SW200 is a clone of the ETA 2824 and the SW300 is a clone of the ETA 2892. These are some of the most robust and reliable movements around. I haven't heard about ratchet wheel issues on the SW300 / ETA 2892.

Go for it and don't worry!

Still, generally, these movements are better wound my the automatic winding mechanism. If it has stopped, just wind a little bit by hand/manually to get it going. Then let the automatic winding do the rest.

Watch Interest · Jul 10, 2025

I got a Christopher Ward in the sale 40% off from £1,250 to £735 with the SW 300-1 COSC. Not opened yet and have 60 day return option.

ErichKeane · Jul 10, 2025

Knebo
The SW200 is a clone of the ETA 2824 and the SW300 is a clone of the ETA 2892. These are some of the most robust and reliable movements around. I haven't heard about ratchet wheel issues on the SW300 / ETA 2892.

Go for it and don't worry!

Still, generally, these movements are better wound my the automatic winding mechanism. If it has stopped, just wind a little bit by hand/manually to get it going. Then let the automatic winding do the rest.

The ETA 2824 is ALSO famous for having problems with the ratchet wheel, though the parts are not interchangable with the SW200.

However, you're right, the SW300 is based on a completely different movement that doesn't have these problems with the ratchet wheel. The ETA2892 is, IIRC, the same as the Omega 1120, and is considered one of the best automatic movements ever made. So I wouldn't hve a problem with the SW300.

Archer · Jul 10, 2025

ErichKeane
The ETA 2824 is ALSO famous for having problems with the ratchet wheel, though the parts are not interchangable with the SW200.

Let me just say this - I have serviced hundreds of ETA 2824-2's, and have maybe seen one ratchet wheel with the teeth sheared off. I have serviced a fraction of that number of SW200's and 200-1's, and have seen many ratchet wheels with the teeth sheared off. The problems are in no way comparable between these 2 movements.

Sellita took a proven and reliable design, and made it less reliable. Even after the change to the "-1" variation, I still see ratchet wheel teeth sheared off, as the tooth profile is still far less robust than the ETA versions.

ErichKeane
However, you're right, the SW300 is based on a completely different movement that doesn't have these problems with the ratchet wheel. The ETA2892 is, IIRC, the same as the Omega 1120, and is considered one of the best automatic movements ever made. So I wouldn't hve a problem with the SW300.

The SW300 doesn't appear to have the same issues, but it is of course a very different design. No where near as common as the SW200's and I've only serviced a couple, but have not seen the same type of failures that the SW200's are infamous for.

FYI - The 2892A2 is not the same as the Omega 1120 - there are a number of differences. The 1120 is thicker for one, and there are changes in the automatic winding system that make several parts not compatible with each other.

ErichKeane · Jul 10, 2025

Archer
Let me just say this - I have serviced hundreds of ETA 2824-2's, and have maybe seen one ratchet wheel with the teeth sheared off. I have serviced a fraction of that number of SW200's and 200-1's, and have seen many ratchet wheels with the teeth sheared off. The problems are in no way comparable between these 2 movements.

Sellita took a proven and reliable design, and made it less reliable. Even after the change to the "-1" variation, I still see ratchet wheel teeth sheared off, as the tooth profile is still far less robust than the ETA versions.

Definitely fair... "Famous" is a poor choice of words there... 'is known to have' is perhaps a better one?

Archer
The SW300 doesn't appear to have the same issues, but it is of course a very different design. No where near as common as the SW200's and I've only serviced a couple, but have not seen the same type of failures that the SW200's are infamous for.

FYI - The 2892A2 is not the same as the Omega 1120 - there are a number of differences. The 1120 is thicker for one, and there are changes in the automatic winding system that make several parts not compatible with each other.

Ah, neat! Thanks for the clarification!

Watch Interest · Jul 10, 2025

Archer
Let me just say this - I have serviced hundreds of ETA 2824-2's, and have maybe seen one ratchet wheel with the teeth sheared off. I have serviced a fraction of that number of SW200's and 200-1's, and have seen many ratchet wheels with the teeth sheared off. The problems are in no way comparable between these 2 movements.

Sellita took a proven and reliable design, and made it less reliable. Even after the change to the "-1" variation, I still see ratchet wheel teeth sheared off, as the tooth profile is still far less robust than the ETA versions.

The SW300 doesn't appear to have the same issues, but it is of course a very different design. No where near as common as the SW200's and I've only serviced a couple, but have not seen the same type of failures that the SW200's are infamous for.

FYI - The 2892A2 is not the same as the Omega 1120 - there are a number of differences. The 1120 is thicker for one, and there are changes in the automatic winding system that make several parts not compatible with each other.

Thank you very interesting

Watch Interest · Jul 10, 2025

ErichKeane
The ETA 2824 is ALSO famous for having problems with the ratchet wheel, though the parts are not interchangable with the SW200.

However, you're right, the SW300 is based on a completely different movement that doesn't have these problems with the ratchet wheel. The ETA2892 is, IIRC, the same as the Omega 1120, and is considered one of the best automatic movements ever made. So I wouldn't hve a problem with the SW300.

Appreciated

Watch Interest · Jul 10, 2025

I read online not sure if this is true the SW200-1 and SW300-1 use the same ratchet wheel for manual wind. However, only the SW200-1 has the teeth on the ratchet breaking off and separate issue only the SW 200 has the helicopter issue when manually winding the crown the rotor spins? Very strange indeed.

ErichKeane · Jul 10, 2025

Watch Interest
I read online not sure if this is true the SW200-1 and SW300-1 use the same ratchet wheel for manual wind. However, only the SW200-1 has the teeth on the ratchet breaking off and separate issue only the SW 200 has the helicopter issue when manually winding the crown the rotor spins? Very strange indeed.

That isn't surprising. I wouldn't expect "we forgot how to make metal strong" to be the reason the SW200 has a problem, but something with the layout/design/geometry/etc. So 'same part' breaking in 1 movement but not in another isn't surprising.

Knebo · Jul 10, 2025

Watch Interest
I read online not sure if this is true the SW200-1 and SW300-1 use the same ratchet wheel for manual wind. However, only the SW200-1 has the teeth on the ratchet breaking off and separate issue only the SW 200 has the helicopter issue when manually winding the crown the rotor spins? Very strange indeed.

The ratchet wheel and winding gears are completely different between Sw200 and Sw300.

The "helicopter effect" happens only if the movement hasn't been serviced for too long (or badly serviced). It's when the reversing wheels become worn or gummed up with old/wrong lubrication.

You are really overthinking it. These are some of the most common movements in the world. And yes, from time to time, oje has an issue. But compared to the number of these movements in watches around the world, they perform pretty f*ing amazing.

And the Sw300 is definitely an upgrade to the Sw200. You won't find many better movements in watches below 2k.

Selita SW 300-1 COSC

Watch Interest

Knebo

Watch Interest

Watch Interest

ErichKeane

Archer

ErichKeane

Watch Interest

Watch Interest

Watch Interest

ErichKeane

Knebo

Similar threads

Omega Seamaster 300 Companion 165.002

Omega Speedmaster 3861 Hesalite Review After 1 Year: Accuracy, Comfort and Daily Wear

Seamaster 300. 166.024. Big Triangle. Service recommendation in Sydney, Australia

1-11 Bezel Conversion on a Seamaster 300.

1959 Omega 2913-3 Seamaster 300 w/Extract, Cal 501

Omega Vintage 2242/1 Salmon Dial Manual Cal. 30T2 c. 1945 Steel 33 mm