Hi Tim,
yes, it is signed with "Riihimäen Lasi Oy Nanny Still" and it's what made me learn a little about Finnish glass design:)
It was my first find (and a very lucky one) - I had no idea what it was (and I guess neither had the person selling it), saw the signature - to me it was just a lot of gibberish, having never heard of Riihimäen - but I did like the colour and the feel of it and it cost next to nothing so I took it home. Did a little bit of research, found out that it's from Finnland and put it in a nice corner.
Strangely enough I found the other two pieces of the same beautiful dark petrol colour on two other flea markets (I love strolling through flea marktes....and can't wait for them to reopen

) only a couple of weeks and kms apart. Guess that Nanny Still bottle made me more aware of the beauty of these pieces.
If I get lucky again I wouldn't mind adding a few more to the "collection" but I'm not what you could call a serious collector so I'm not spending a lot of money (yet?)
They really are beautful in their simplicity and do look amazing as a group though...
The amber one is a recent addition (as are the little candle holders) but it's not signed or engraved. The base is clear glass. It only has a label.
But it's interesting to learn that they have been given as presents, now I'd like to find one of those, too

Did the company give those away?
The Finnish certainly do have some beautiful glass