How to know the "network version" of an alt currency?

[crazydownloaded]

Hello,

I'm setuping my own cold storage for my *coins, and I'm willing to use pywallet to dump all my keys at once.
My problem is I need the "version" of the keys stored in my wallet.dat for my various coins, so that pywallet can return the good addresses/keys.
My cold storage computer is running Linux (Ubuntu 13.04) and I've the source code for every coins. Can someone tell me where to look in the source code to find that version number?

Thanks.