Well, this generator used the CD4060, which is a binary counter. Unfortunately, there's no standard quartz I know which yields exactly 440Hz, if this is what you need.

Why not following the approach discussed here

http://www.8052.com/forum/read.phtml?id=125098

but by using a 12MHz quartz?

Take note: If you want to produce the whole series of frequencies (G,D,A and E), then the 11.0592MHz quartz is better suited, because the deviations within the whole set, means between the frequencies, are minimal then.

I should add, that 440Hz is not always taken as the tuning reference. Many conductors let the instruments tune some Hz higher than 440Hz and let the music play a bit faster, to make it appear a bit "fresher". But I don't like that at all. A bad example is the "Brandenburgische Konzerte" by Johann Sebastian Bach, which sound terrible with this modification. The only record I can hear without being in pain is from the 1960ies.
Also, playing the concerts much faster cannot be right, just because the players of instruments at that time couldn't play as well as we can today. Also, the instruments weren't as good as today. So, I'm convinced, that it's an anachronism to mistune the instruments and play the concerts faster.

Kai