Think I found something on the old-omegas.com website:
I've seen white on black date dials, but mostly on black dialed watches like the Seamaster 300 (which has a very similar movement). It shouldn't be a big deal to get a replacement if you want one.
Looks like the Ref. 166.001 in either 14K or 18K gold. You'll need to visit the watchmaker to find out which fineness you have. However any solid gold Omega is going to easily worth more than $400, so you did real well.
Happy New Year,
gatorcpa
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