WMB — A difficult subject, on which there has been little authoritative research published.
Were tumblers in purple slag reproduced during the 1960's?Probably. Davidson certainly introduced their
MARBLE glassware in 1964 (known to some collectors as
LAVA), using old moulds.
Would they have been marked with a lion trademark?Yes.
If number two is "yes", is there a way to distinguish between the old and the newer?Sometimes. If the old mould carried an original Davidson TM, then differentiating comes down to analysing the glass used, so is effectively impractical at the current state of knowledge.
However Davidson introduced two sizes of new Davidson TM mould punches. These were very similar to the old TM punch, but, in my opinion, have a slight hint of Prince of Wales Investiture Welsh dragon about them. These will be easy to identify as those appearing on post-1930 Davidson and Jobling moulds must be from the 1964 Davidson TM punches.
Unfortunately no-one has yet researched and published this nicely bounded project.
See Stewart & Stewart,
Davidson Glass, for what is currently published on this subject. This book is obtainable from Broadfield House Glass Museum.
Bernard C.
