The reference is in Stefania Zelasko's book "Josephine Glassworks Art Nouveau - Art Deco - Modern 1900-1950" published in 2009. Stefania had access to the design books of Josephinenhutte and photographed large numbers of its pages in the book. The photograph of the page in the design book for the roemer in question is on page 201. The design book heading is for service no. 1349 and 1350--this particular roemer is form 1349/II. The subtitle for the design book page says that 1349/II was designed by Siegfried Haertel c 1912, the realization of the design from 1912-1930, the form is Josephine Glassworks Master Book c 1923, table 55, h. 28 cm. Three examples of this form are also shown in two photographs--two are housed at the Glasmuseum Passau, inv. no. Ho 69870, Ho 69826; the other from the Muzeum Karkonoskie Jelenia Gora, inv. no. MJ 412/S. All these examples were described as having 7 bubbles of air at the base of the cup, match the form precisely, and are 28 cm high. The form of this roemer in the glassmessages discussion matches the Josephinenhutte example exactly in all respects, and even matches the number of threads and position of the twist bands shown in one of the examples. The roemer was bought in the U.S. which was a huge market for the company. One can't say that all huge roemers are Josephinenhutte--only this one very specific form.