https://www.glasmuseum.de/en/buchbestellung/translate-to-english-josephinenhuette-1900-1950-band-ii/#lightbox[468]-2
https://www.glasmuseum.de/fileadmin/_processed_/a/0/csm_Josephinenh%C3%BCtte_2_-_2009_-_03_9b07e17c90.jpgI think from Josephinenhutte 1900-1950 Band II - see bottom of left hand page, right hand column:
Some information here (can't read page number clearly enough - so apologies) that discusses the range Vineta-Kristall in connection with 'Erwin' and in the same sentence as referring to 1928 and A Pfohl's departure from Josephinenhutte. So possibly that photograph from Dr Arthur Traube dated c.1925 is more likely dated to later 1920s?
and
Translating the information printed there describing the Vineta-Kristall range and using Google translate (very hard to enlarge to read script clearly though!) it appears to say:
'Consisting of numerous colored shapes, melted with flakes and filigree ribbons. This is a mass-colored crystal that, thanks to a special process, imparts seemingly random coloring.'
Quote in German - apologies if incorrect but it is very hard to read:
"
bestehende aus farbigen, zahlreichen formen mit Krösel einschmelzen und band filigran. Es handelt sich hierbei um ein in der Masse gefarbtes Kristall dem ein besonderes Verfahren scheinbar regellose Farbwerkungen verleiht"