I nearly missed this one, but upon close examination I discovered a tiny "Y" on the skirt of this CD 128 found in Argentina. It has a tiny "right leg" to it that was impossible to capture in the photograph but visible with my eye. To see a close-up of the embossing [id=187660328]. This marking has been found on a few scarce examples of CD 129 insulators, but in a slightly larger size. For an example [id=]. The manufacturer is unconfirmed but I'm actively pursuing it.