it looks very much like my staub "double handled grill pan". but my staub has the name on each of the "helper handles".
It may very well be a copy cat or might be the work of a subcontractor that staub used, then switched, but the subcontractor still had the original molds.
I have staub, LeC and many other enameled cast iron pots and pans. it doesn't have to be a major name brand to be good. I've got tons of Lodge, Tramontina, and other brands by designers like Daniel cremieux. They're all good! and when I say I have a ton of enameled cast iron, it isn't saying I own a large quanity,, it's just that cast iron is do heavy. LOL
Again,, it's probably made by a staub subcontractor that is no longer making for them