Bit of a detour but this topic has been bugging me for a little while and I keep forgetting to make a post about it. Ron had posted a marble that he identified as a Vitro Sparkler a few years ago in a big Vitro ID thread on the AAM boards. The mib he posted does seem pretty different-looking from an Akro Sparkler, but it's been difficult to find more information about if these are indeed a thing or not, how to ID Vitro Sparkler vs. Akro Sparkler if they are a thing, etc etc. I know you know your Vitros, @Ric - maybe you can help demystify this one for me?