Yep, there's a crest. Covers the entire top of the ring with little marks like 5 minute marks on a clock. It was made by the German small arms and ammunition factory in Berlin.
Wayne
That would be DWM, Deutsche Waffen-und Munitionsfabriken. Judging from your description, I believe the crest is other than Brazilian. Post a picture of it if you can, I'd like to see it.
