Zumwalts book pg 171.Listed extremely rare(more have been found since books publishing dats)Geissen first listed in 1857 as a grocer,mustard manufacturing listed in 1862,by 1875 listed as a wine dealer.Might have sold the mustard manufactury to Gulden as address was similar.I need this one for my collection if you want to sell it.There is a another type of his mustard without the eagle