The cristallerie in Verdun was set-up in 1930, by Maurice Model, in an old flooring factory. Glass was produced for export only and mostly to USA. The factory was destroyed by bombs on 15th June 1940. A school was built on it's site and the directrice of the school is now researching. I shall point her to the thread.
Frank, you're a star - thank you for the link!
Here's a poor shot with my mobile of 'M Model Verdun' mark - difficult taking this from a lamp at the ceiling

The other two images of this lamp were made years ago and never shown online
