Question

Can anyone explain to me, i think i read somewhere, that if the glass is signed, it was made by the author of the piece. Is it true?

It could be the glass company and/or the glass blower and/or the designer - someone may have designed the original pattern before the company put it into production and others have actually made it or at least finished it off. Sometimes it has the company name and the maker's/designer's initials

I'm talking about the times when it has company and maker's initials, because i can find pieces which has it and totally the same pieces without any signature, what is the difference between them.

A lot of the IIttala moulded pieces by Tapio Wirkkala are initialled "TW" but I
wouldn't have thought he actually made them, just designed them.

Did Per Lutken make all his signed pieces of Holmegaard?
I doubt it somehow.

Yeah but still what's the difference between signed and not signed

ikod wrote:Yeah but still what's the difference between signed and not signed

If the same item signed or unsigned, the difference is the value and it can be quite considerable.

Yes, value. An unsigned piece by a company which usually signs them implies it's a second or a fake

But i found a lot of pieces that are unsigned, but they are not fake.

It depends on whether the glassware is USUALLY signed or not. Yes, there are a lot of pieces that are not signed because they are designed by someone and then mass produced in the factory.

Items which are limited editions and/or made by the designer personally, or finished off by a trained glass technician, are far more likely to be signed. And those that are not are likely to be seconds or fakes

No is the answer to your question. There are larger studio glass operations where the glass is made by a number of people, but still might be signed by the person who designs and run the studio. Really it varies a lot and you just have to research the individual factory or studio.
As to why some pieces might be unsigned, yes sometimes it might be significant, but with some makers it's of no significance at all...there's no real rhyme or reason why some pieces of Mdina are signed and others aren't for example.