Which Oyster Perpetuals had self winding

[BraveBold]

Originally Posted by R.W.T.

That's a post 53 2940 likely. By that time the text had changed.
There's not a lot of rhyme or reason to the nomenclature on the dials.
It could've said precision. It could have said officially certified chronometer.

The straight text is very normal for the 50s versions.
Very often you see that on say 6298 explorers.
The thing is...if it doesn't say Officially Certified Chronometer, it likely has a movement
that didn't get a cert or in some cases one with less adjustments. I have seen 3 position 630 NA's. Those also won't say Chronometer on the rotor. Sometimes a non certed 6 position watch will get the Chronometer Rotor or...they got changed when they failed.

Thank you. I don’t have the watch in-hand but this is very helpful.