I used to have a very simple egg scrambler, metal, a kind of flexible wire spiral with a handle. As you beat with it, the flexible spiral would somewhat amplify your hand motion. Cannot find another one anywhere.
I think you probably mean a Spring Whisk The ones with a flat spiral bottom can be had at Amazon. I'm not seeing any of the old style, with an open bottom. That shouldn't make much difference to an egg.
I think this is what you're trying to find. If it is, there's one on ebay for $24.00 (link follows picture below)