Mystery Ignition Box

Howdy everyone and happy Sunday! I have a problem I need help sleuthing out on my '68 Barracuda. Ever since I've owned the car, I've known it has electronic ignition because I went to replace the points and condenser when I bought it, and well, it didn't have any. It had a magnetic pickup instead. Now, there's a small wiring harness that runs to a mysterious, silvery-blue metal box that's mounted on the passenger inner fender. It's scratched to hell and I have never been able to pull any identifying information off it. I was wondering if maybe any of you wonderful people could help me identify what it is? I would like to purchase a second one to have as a spare for the car, but I'm worried that I won't be able to find one... it looks quite old. Any luck?

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I apologize for the picture quality, I never took a closeup of it. I may be able to get my dad to send me one later this week if he has time.