One of the people who have commented on it in had the following to say.
DO NOT OPEN THE BOX.
RADIACs contain a radioactive source which can contaminate you and give you cancer. The source is shielded but I would advise you not to tinker with the internals of this device.
Nice to know that they are selling potentially lethal stuff at auction. Chances are that it is a timing device, most of them use Cadmium or Radium decay to produce timing.
__________________
"The future is here. It's just not widely distributed yet." -William Gibson
DO NOT OPEN!!!!!
Well, this kind of thing is really interesting to me, I love to dig around in old "stuff" and find out where, why, when, etc..
here are a couple of interesting web pages about the "thingy's" makers
1.) http://www.abovetopsecret.com/pages/egg.html
2.) www.dtra.mil/toolbox/directorates/ td/programs/nuclear_personnel/docs/DNA6030F.pdf,
I will let you know if I find out anything more specific.