Hello and hhhmmm - interesting ... This is based on an egg cup ("Eierbecher" in German) , designed by Wilhelm Wagenfeld for German WMF, late 1950ies, if I am not mistaken, produced in stainless steel only. For copyright reasons I cannot post vintage catalogue material here, but one should be able to find a lot online. This here is kind of a spin off of the original design and I wonder whether it has been authorized by WMF ... Regards, Bahner