Here's a photo of the green threadless CD 731 on the left and another unembossed CD 731 in light blue. I got the light blue piece from a dealer at Springfield who said he has had the piece in his collection for 30+ years. I remember him from those early days and have no reason at all to doubt him. Not sure about the green one, but boy do they look alike. Like I said, if this green one is not real and someone is faking them, that's scary.