Do any other makers use the three coloured eye that is often found in Pirelli lampwork?
Typical Pirelli eye
And this one?
Note that the one on the right has a poorly placed pupil. Every labelled example I can see has a well centred one, mostly constructed as a layer of white, a layer of colour (iris) and a black (dark) pupil. I have seen unlabelled ones where the colour is behind clear glass with the iris on top - second example above.
Were Pirelli the only ones to use 3 coloured eyes? If not who else did... any labelled examples. It is just possible that Pirelli ones vary because of the worker involved and of course some 30+ years of production.
I do have at least one Pirelli with the iris on top of clear but it is very well centred.
B.B. Not all Pirelli has 3 coloured eyes. Plenty of 1 or 2 coloured eyes too.