Yes there is a lot to read on this glass range on the GMB. So a brief basic summary to help you find your way through it all.
Range introduced as Lord designed by Rudolf Schrötter for Inwald (Rudoldova Hut) around 1920. Produced until early 2000s. Clayton Mayers were factors/importers and registered designs. Rebranded for UK market as Jacobean. Inwald also licensed production to Davidson in Tyneside.