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My understanding is that there are 58 shades of white. Like most companies, Omega likely used fewer colours of white on date wheels than they did colours of white on dials. Maybe three shades of white for date wheels, and a dozen shades of white for dials. I have seen white date wheels on watches with black, green, gold colour, grey, dials, etc. etc. And of course white date rings on white, silver, grey dials, etc. etc. etc. Chances are you will never find a date ring that will match exactly. Chances are dials and date rings (these are not made by Omega) were made by two different companies, and months, or years apart. Don’t obsess over it!
Well then. Good luck for a better explanation, and a date ring that matches EXACTLY! 😁 I have numerous calendar watches from a number of watch companies with dials of a variety of colours. They all have white or silver date rings. A problem? 🥱 Here’s an example. An Omega with a white dial, and silver date ring. I’m not saying you shouldn’t fret over your date ring not matching to suit you, but what do you plan to do about it?
Well then. Good luck for a better explanation, and a date ring that matches EXACTLY! 😁
Is the calendar ring textured/sparkly ? It kind of looks that way from that photo... One thing is for sure, you can't just use any calendar ring on a movement because only few will match (either a genuine one or, by chance, one with similar/identical dimensions made for other movements) so it's not that easy to replace it with a fake one if that's your concern.
The crown looks like a replacement, doesn't it ?
I wouldn't expect a silver date ring either. These 550 series date rings came in different colours so, it may have been replaced due to damage and the closest easily available ring was silver. Of course, it may have had a silver ring from day 1... Here's a similar watch I have with a date ring that matches the dial better:
Take it to a watchmaker to open it and see if it needs a service. When they get into it, if it needs to come apart for a service, ask them for an Omega ring in a better colour. If you get stuck, I may have one in my spares boxes.
Cheers, Chris