The photo captures the "Y" but it is unfortunately partially obscured by some cold mold pour straw lines. It's possible this is a random creation of the cold mold, but it's too strong of a coincidence the Y is shaped identically to the ones found on CD 129s- complete with a "right arm" (not visible in this photo due to reflections of the lighting). This is believed to be an embossing from another Chilean glass manufacturer after Cristalerias de Chile ceased its production.