I have a DM 80 reflex moderator, bought recently on a Heym 7x57. The chap I bought it from did not know what make it was, and neither did I until there were some kind posts which informed me of the make. As proof here are the Google images;
And here is mine;
It is proofed and stamped 7x57, but there are no makers marks. It has a rear bush, but for a very light sporter barrel so there is plenty of room for reaming it out to fit a larger barrel.
The only marks on it are some small scratches on the paint. The moderator also has a strippable front reflex unit, being accessed from the front by means of a srewed cap. It weighs 592g and is 10.75" long and is threaded 1/2" UNF.
I will post photographs in a while. If anyone wants a cheap and hardly used 7mm moderator then £110 ONO will have it winging its way to your local RFD