UK made Omega Constellation without "swiss made"

Looks like the crystal/tension ring is incorrect and covering the ‘Swiss Made’.

It’s not just the case back that was made in England. The whole case was made in London by Shackman, also known as DS&S. The dial isn’t located centrally, as noted above it could be because of the wrong crystal or maybe missing case clamps. It looks OK otherwise.

If he's certain there is no Swiss Made - which he can only be by extracting movement/dial from the case and looking at it without the plexi - then it might also be cleaned. I have an original dial of another kind of Constellation that's beyond doubt, but there's no Swiss Made. It's easier to spot in the case of my dial as it has a cross hair which also fades towards the edge and is completely gone where the Swiss Made would be. Also, there's minute residue of what I suspect might be Rodico, so obviously someone cleaned the dial and overdid it.

Anyway. The cleaning, to me, is the less likely reason, as it usually damages the dial visibly. Can he provide a picture of the dial outside of the case? The reason we assume it's just the tension ring is that, well, it happens frequently. Look at other C-Shapes online - you'll note the Swiss Made is right underneath the 6 o clock index. On the watch you're interested in, the tension ring almost touches the minute ticks / 6 o clock index, so even if there is the Swiss Made writing, it'd be invisible as long as the watch is assembled.

Unless I'm told otherwise by some of the numerous legends around here whose knowledge is unspeakably greater than mine, I'd claim that no C-Shape dial left the factory without a "Swiss Made" at the bottom.

You wouldnt be able to see anything if the tension ring covers it all...

This is how it should look. Note how much dial is showing below the minute markers.



Compared to:



An ill-fitting crystal could also mark the dial, I'd be wary if the seller is unable/unwilling to show you the whole dial.

Looks like the step was cleaned to me. The edge of the tension ring is visible and it isn't covering the Swiss Made.