Hi Sue - I think around late 50s would be a good estimation as to the age, the appearance of the base wear would also seem to correlate.
The shape has a nice organic feel, I also like the way the cutting to the reverse is visible through the amber from above, which adds another dimension.
I have been doing a little bit of digging here and there, although no luck in attributing a specific name to date. Would be nice to establish a maker overtime, however, the quality certainly seems to shine through regardless.