Most Series 90 ECO left the factory red, but some companies had their air meters painted to order. In particular Marathon and Mobil requested special colors. Probably none left the factory with special ID tags. As Ron mentioned, some companies may have added an ID tag to the unit before it was installed.
The last light that as placed on top a a ECO unit was in the 1930s. All light units available to put on the Model 90 series units are fantasy as Ron said.
If you need any parts for your ECO Model 90 unit, see my website:
www.crspub.com Jack Sim