Addendum 2:I give up! I've just been going through my collection for the research website, and I've spotted that there are FOUR variations of the circular red label I'd not noticed before! It did strike me that 1936-65 was a long time to have the same label without being tempted to at least tweak it a bit.
Red Variation 1 - As illustrated in McConnell.
Probably c.1950s.
Red Variation 2 - Taken from a 1962
'Greenland' vase.
Red Variation 3 - Taken from a boxed set of
'Skotland' glasses. I
think the design hails from 1961, but I'm just working from a very sketchy drawing in
'Glass is Life'. Added to my uncertainty is the fact that the original packaging looks earlier. Note that the label bears the number 42.
Red Variation 4a and...
Red Variation 4b The first label is taken from a boxed set of
'Elsinor' glasses, with packaging probably getting towards 1965, and the second label from a set of
'Copenhagen' glasses, no box, so no idea of production date. They too also have numbers on the labels, but I can't figure out the significance of them. The second label also has a different texture - it's glossy and embossed, whereas the first one is flat and papery.
Why is life never simple?