I've had a GEM MMCC for a while and got a MMOC today. Noticed that the CC is badged as a Clog-Pruf, while the OC is badged as simply a Micromatic. The CC was advertised as NOS in box (old style paceboard w/cellophane window), the OC was in a clamshell case (leatherette cover) with GEM insignia inside. The CC appeared to possibly be NOS and shaves very well. The OC show some sign of use, especially the box, but cleaned up beautifully. Question is...can you date the GEM's based on their badging? Just curious. My experience with DE open combs has been great and I am looking forward to SE Sunday with my newest acquisition.