Deutsche Briefmarken mit Werbeaufdruck Salamander, Gütermann, Baden-Baden, Herpich Söhne

Four 150-pfennig stamps from the german empire (“inflation period (ex mi 189)”) with advertising prints “salamander the fashion shoe”, “gütermann’s sewing silk”, “spring in baden-baden”, “furs only from herpich söhne berlin”. A private creation? Unknown date