OK Computer (Radiohead) Easter Egg - Album Finish Date

There's a strong possibility that the numbers on the back of OK Computer (18576397) stand for the exact time that the album was finished (note the arrow pointing up to the tracks). So:

1857 = 18:57 = 6:57 p.m.
6 = the 6th
3 = March
97 = 1997

And there you go. OK Computer was completed on March 6th, 1997 at 6:57 p.m.