I have a ton of experience in this field, especially medals. German WWII items are some of most highly and professionally reproduced items in history. There are some items that are indistinguishable unless in hand or unless there's dozens of close up pictures. I own books, 500 pages + on just a single badge and its variants. Having said all this, the best thing to do is to go on to the WAF forum, search your item and look and both the positively and negatively reviewed versions of “Deumer EK1”
2 examples I just saw on reputable dealer sites have the maker mark below the catch. Your version is obviously different but that doesn’t mean it’s fake.