I noticed that one in your Pelt group too - it sticks out like a sore thumb. I sorta wanted to say something, but I don't like to rub anyone's fur the wrong way. The one in my pic is a transparent green base with white and red striping - Guy used to call them transparent christmas trees. I am about 95% sure it's Kokomo, based on dug cullet and marbles, and without seeing some dug or bagged examples from Peltier, I would put yours right next to it. Back in the day, before much was known about Kokomo marbles, a lot of the nicer (and rarer) ones were attributed to Peltier, and I can pretty much guarantee that some of them are still in Pelt collections.
Having said that, I rarely see Peltiers categorized as Kokomos - most of them are just way too nice and don't fit well in a group of Kokomos. The vast majority of Kokomos can be described as "interesting", "odd" or "cool", but if most people would call it "pretty", the likelihood of it being Kokomo is slim - not that they didn't make any pretty marbles, they just didn't make many of them.