nice tumbler bat - better quality than most pieces with pteridomania engraving, and my thoughts are possibly much nearer to the beginning of Christine's suggested dates. Blown and with a wide, shallow pontil depression, it has in fact some features of much earlier tumblers - the very wide mouth being a feature of some earlier pieces - and including insects, which most ferny pieces didn't.
In truth I'm not entirely sure of what date to put on this one - it could be earlier than we are thinking.
Don't know that I agree with the mayfly suggestion, although it may well simply be a stylized example. To me it has that large hindwing, robust looks of a dragonly, but who knows.
Let's see what others think
