Last Updated: Nov 27, 2016 Views: 40
Thank you for contacting us. I checked the Journal of Glass Studies article you mentioned, v6 1964 page 91 and found a footnote that led me to this source:
Main Author: Schmidt, Robert, 1878-1952.
Title: Die Gläser der Sammlung Mühsam; Neue Folge, beschreibender Katalog mit kunstgeschichtlichen Einführungen, von Robert Schmidt.
Publisher: Berlin, Ernst Wasmuth 
Description: 77 p. ill., 36 plates incl. 4 col. 37 cm.
If you wish to receive a quality reproduction of the photo within, please contact our Rights and Reproductions department head. They will be able to help you with this.
I searched our catalog (https://www.cmog.org/research/library/catalogs#.UOWlpm_BF8E) for the name of the beaker, but was unable to find any matches. Feel free to do any additional searching there for any glass-related information you are hoping to find.
I also suggest that if you have not already, you should contact the Metropolitan Museum of Art as they have the object. I was able to locate it on their website here:
That photo is likely better than the one we are able to provide you with, since it is of the actual object. You can contact them for further information from that page.