gold-possibly as high as 20K. The keys and other parts need to be
Elizabeth, this question has come up before - not flutes, but mixed
And I’ll assume you are in America because you didn’t say otherwise.
I’m not sure I’d make a flute out of any standard gold alloy higher
than 18kt because of durability - there are some more exotic
alloys… But that’s another issue…
The key is solder… If the pieces are soldered together then you can
stamp the main piece - I believe it was established that it’s not
necessarily the letter of the law, but it’s a fact that it’s common
practice. On your flute you cannot legally stamp the body of the
flute both 20kt and 14kt.
because the keys are separate parts. You are supposed to stamp each
key separately, though you don’t have to stamp anything at all. You
can sell gold rings all day long without stamps, you just can’t call
them gold - again, by the letter of the law…