Hallmark on luger's key

[Deruelle]

Hi everybody,

Recently I have the chance to buy a german Luger holster with one key inside. I can't believe when I saw the price. I think, the seller can't sell this holster for this low price. And yes I bought it. The holster is not in good condition but the hallmark is nice

I just want to know if someone can confirm the hallmark on the key. I suppose it is for Erfurt, but I can't find it in my archive. So may be someone has the clue. I will post several photos of my key.

Thanks for your help

Regards

Christophe

[Deruelle]

Close up of the hallmark