Distinguished SOTW Coffee Guru
It is not a question of lying, lots of people call “ silver” things that are only silverplate.My teacher who I bought from back in the '70s said it was silver. I do hope he wasn't lying.
Being Solid Silver a rather important difference is the reason why many (but not all) flutes would have been stamped with some sort of identification (compulsory in the UK and France I believe)
I have had a solid silve r flute which wad made by Jack Moore and was never stamped silver, so, it can happen