Hi Paul,
thanks very much for your reply on my search. Is it possible to post a picture from the page with the glass(es) from that book?
Indeed I expect something in the range from 50s-60s, for me indicating 'relatively old'. I've added two additional pictures, showing the difference in thickness of the bottom (not very good to see), which is also reflected by difference in weight (256, 229, 180 and 224 grams). Next to that, I also tried to make a picture of one of the intact rims showing not a smooth edge. This made me think of hand-blown glasses.
As you already indicated, these kind of glasses can also be made recently anywhere, e.g. China, India.
Best regards,
Mario
the Netherlands