3 Omega marked crowns appeared in the parts drawer today. Ten sided, gold colour and with Omega logo.
Can't remember how or when they came in.
Are they as they should be ?

Was very hard to take a decent picture of them with my phone. Expecially the saturation/colour is off

 

Gold colour on these crowns usually in 18k yellow gold colour, if you put them on 14 k gold capped case, there will be a mismatch.

 

Are they authentic ? and if so, which case ref's would they match with?

 

I think they are new replacement, by looking at the thickness of them, I would guess they are for 2852 constellation.

 

What is the crowns' tube size?

 

I'm not sure I'd be able to measure that.