Bought this machine the other day. Did I correctly determine that this is Omega 30t2?
What can you tell about its year of manufacture from its serial number?
Is it possible to find out what case design this watch had? Is the crown original? (she's without the "omega" badge)
The dial seems unusual to me, I see such an arrangement of Roman numerals for the first time. Usually they are located not horizontally, but radially.
And why is this stone white and not red? is this bad or normal?

 

You will probably get more responses if you post in English.

 

Oh, sorry, fixed it. some auto-translation functions in the phone browser

 

Thanks!
Today I took a closer look and found the inscription 30t2 under the balance)
But why was this stone red on most of the movement of that time, with some kind of limited series with a white stone?
I was confused by the dial because it is smaller than the diameter of the movement.

 

Uh-Oh mine has red stones. Pretty sure it came that way.

 

This jewel is not oiled, so that theory is out the window...

 

Isn't that for the pallet? Why wouldn't it be oiled?

 

Just because there is no need to do so - believe the professional watchmaker!

 

If you give it some though, it should be pretty clear why. For the vast majority of the time, this part is stationary - it only moves when the roller jewel engages the pallet fork horns, and moves the pallet from one banking to the next - usually something like 50 odd degrees of rotation - essentially the lift angle. So this is not a high wear item.

In addition, you don't want to hinder the movement of the fork, as that would rob the balance of amplitude, and oiling this pivot would cause drag.

There are some schools of thought out there that very large movements (like those in pocket watches) should have the pallet pivot jewels oiled, but if you look at the tech guide for the ETA 6497, which is a pocket watch movement, no oil is called for. I think the only watch movements I've ever seen oil recommended in this location for, are some Seiko movements, but they always have lousy amplitudes anyway (at least in my experience) so for those it might not matter...

 

Thanks for the explanation. Always learning something new around here.

 

Yes, it seemed strange to me too. And if the stone is red, the master cannot know whether to lubricate it or not?))
I think it's more likely due to some interruptions in the supply of stones during ww2, for example. Therefore, instead of corundum, they put sapphires, perhaps.

If you could give examples of reference with the same dial, then I would be very happy.
I measured the dimensions, it turns out that the winding shaft to the head is 1 mm long. With a movement diameter of 30mm, the case could not be larger than 32mm, while the diameter of the dial itself is 28mm

 

Took off the dial and found a couple of interesting things.
First - I thought the numbers and hour markers on the dial were just painted with paint. But they appear on the other side of the dial, apparently they were applied in some electrochemical way.
Secondly, the manufacturer's mark was found on the dial. This is not Omega, this is a third-party manufacturer Lemrich suisse, next to it is the L&Co brand and numbers "6 28"
By the way, there is no "swiss made" inscription on the front of the dial itself.

 

Of course because Omega did not manufacture dials themselves...
Lemrich is one of the frequent contractors

 

Thanks
I thought that even made by other manufacturers, the dials will be branded "Omega"

 

Hello again everyone.
Tell me, what is the size of the screws with which the 30t2 movement is attached to the case?

 

Check the case you want to put it into first. In some set ups, you don't need them.

 

Thanks!
Yes, it's logical!
But I will use them.

 

It's a bit hard to see in the picture, but the stone looks to me it was replaced with a bushing.