I think it may signify a later pair: I did notice no Sku: number, but was just going by the earstem Icon text. Which appears to be as good as OEM, looking at the 'crispness' of the glasses, there was one thing which I'm not totally sure about. The Made in USA isn't on the left earstem, maybe rubbed off, or could be a rep pair, or prototype?Thanks for the reply. I hadn’t seen any before without any kind of model number printed on the inside of the earpiece