
Hi.
Unfortunately, a little blackish color usually means that the display has started to "bleed", which is irreparable. It's a pretty simple matter to swap the display if you can find a replacement. You can either:
(1) try to find another 0624 to scavenge the display from or
(2) I believe the display from a Seiko 0662 can also be used in a 0624. The 0662 model is much less sought after and easier to find:
http://www.digital-watch.com/DWL/1work/ ... 5009_5009/
If your 0624 is truly in like-new condition, then it's definitely worth trying to fix since this model tends to be quite highly sought after.
Cheers,
-abe.
p.s. I have a spare non-working 0624 that could be used for a donor display. You can PM me if you're interested.