Thank you Christine!
Googled immediately Dr. Julius & Hamburg to find more on these windows and where they might have been installed here until Golgatha/Feuersturm of 1943. Unfortunately without success.
If I understand it right: those in St. Helens are a reproduction made by the artist himself after war.
Wikipedia only leads to a certain Dr. Julius Moses in Berlin - who died 1942 in KZ Theresienstadt.
Interesting anyway - thanks again!