I'm still waiting for my two-tone 168.025 to turn up.
https://omegaforums.net/threads/connie-168-025-with-vertically-brushed-two-tone-dial.40848/
As you say the dial centre is a lot lighter in color, but whilst researching these I concluded that the gold cap ones came with the light grey color, and the plain steel cases came with a darker color. That was based on really limited examples though so may be entirely incorrect. Here is a link to one if them.
http://www.watches.co.uk/watch/17114s/omega-vintage-constellation-pie-pan-dial-168.025/
But yours does look darker than even this one. Can you make out vertical brushing on your example ?
Then the main hour markers look painted as they are wearing at the edges. The best example would be the 2 o'clock one. I thought these were onyx but there is no definitive answer on that, and I can't check mine as it's not in my hands yet. And what's going on between the date window and the 3 o'clock marker ?
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