A CD 728 from my collection. Picked it up last year when a friend from the flea markets called and said he had a couple insulators he wanted to sell that he found. I don't have much exposure to the CD 728 but I see listed in both price guides is just no embossing and no other markings on it. The one I have has a mold line over the dome, I don't know if that's common for the 728 but I know its not listed in the guide, so it had to of come from a different mold than the other 728's. It is very clean and mint.

Update: A big thank you for the information about this piece. From what I have heard it is a error in the price guide and that most are with the {MLOD}.