The fourth generation design from Oxygene. The Oxy 4 came with instructions, in a simple pull string bag. This model was smaller in diameter than the third version, with super wide gap and body.
One half is engraved with the model name, "Oxygene IV" and the Serial number. Pictured here is #65. The name is visible in the Profile View, and the number in the Response System view. You'll also notice Carlo's Pictures, taken by Carlo Menon, the creator of Oxygene yo-yos.
