Art, I wish you best of luck but it will take a loooong time I suppose.
I have only seen 2 with dark dials so far (both two-tone black and anthracite grey, but both different with inverse colour pattern) - and I have seen quite a lot of them... no mere black version so far
But you may find a ref. 2423 with black dial more likely if you are lucky
Already own two black(ish) 2242s, Erich, so a 2423 won't completely quench my thirst for a 2410 (which, btw, is the only rg I've ever seen with a dial other than white).
I know they're out there, it's just a matter finding one!