Might be a cold surface coating. Try scratching it on base.
Thanks for your input Frank.
I seem to have the slowest internet connection in the World and trolling through image/content rich pages is near impossable currently, so thanks for taking a look too.
Regards 'surface treatment', I tried with a diamond file and no, it is actually solid coloured glass and not a plastic or flashed colour on clear.
In good light I can see a few small bubbles and what appears to be die/mould dilapidation.
You find similar 'dots' on pressed coins due to die pitting, so thats how i assume the same on this. It's not a design feature. Same sort of flaw can be seen on base image here, like as if the base 'cup' element of the mould had a scale build up.
I can see glass thickness in body is thinner than base, thinnest in neck region. I see this with strong light inspection. The bottle is very clean, but I see what appears to be very small dark spots in the base region of glass, like some form of trapped contamination in the glass.
The tactile feel comes from the satin external finish and the pretty almost glowing colour effect comes from reflected light off gloss internal finish. There is no glow from UV light.
There is virtually no base wear like 'cabinet rub'.
This was found in regional Western Australia. The region has a history of Italian folks settling there for some time... there was 'new' and 'old' money around there dating back to the mid - late 1800's.
This known history and features of the glass have me assume it was a perfume bottle 'of age', but absence of wear seems to be a contradiction to that 'age'.

I'll try asking someone on those site links provided by Ivo in time... when I can get to a faster internet.
I don't know if you know we have rather low ranking Internet speeds here in Australia compared to other parts of the World, unless your very lucky to have fibre at home... but thats another subject that could turn into a nasty 'political' argument.
