I agree with the others that you deserve many thanks for "keeping this show on the road". I have thought about the burden on resources of hosting all these photos and I try to never upload the same image here twice. I just go to my attachments and copy the image I uploaded earlier to insert it in a new post. Some systems have algorithms that will prevent the same image from being stored more than once on a server but I don't know if such a system operates here.
Akro marketed some of it's opalescent marbles, sometimes referred to as "Flinties" as "Fire Opals". The "Opal" associated with Vitro is a collector's name and the multi-color marbles are very different than the Akros. A search here will turn up many examples of both types.
Thanks, Dave. The only real Parrot is the middle one. The outer two have colors veneered on clear transparent base glass - sort of like a 4-color Tiger Eye. Chuck B. called them "Vienna Parrots".
It's a typical Conqueror with a "V"-shaped patch but not a fancy or exotic, and while the OP marble is a Vitro, it's not a typical Conqueror - looks like a variation on the theme though.