The red, yellow and blue one is a cool marble but it doesn't look like any Peltier Rainbo I have ever seen. The colors look more Vitro, but again, unlike any I other Vitro I have seen too.
Would it really surprise you if there were some hand-made ones out there? In many cases, machines are made so things that were once hand-made can be mass produced - just like glass marbles.
🙂