From one of my walks earlier in the week - apparently 'Pantareuna' means folded rim, and one of the very short i-series of pieces designed by Sarpaneva, and made in burgundy, green and this blue between 1956 and 1960 ............ hope I have all the details correct, but if not please shout - apparently green is the least common - this blue one looks to be i-302. Timo Sarpaneva worked for Iittala (Finnish) for what seems like eons - a very highly respected designer.
Diameter about 8.5 inches (c. 21.5 cm.) and height about 6.5 inches (16.5 cm.) - ground/polished flat base, with stylus inscription which reads 'Timo Sarpaneva - Iittala - 57'. About the right size for a goldfish bowl - provided you didn't want to see the goldfish.
Copying some Scandi designs and features was not uncommon from the early 1930s through to 1960s - W/Fs and others, and this folded rim appears to have been copied by F.T. for Dartington - possibly in red only and such pieces are uncommon and probably expensive - unfortunately, I don't have a Dartington example to show, but if anyone cares to add a picture it would be an interesting comparison. I now forget the approximate date of the F.T. introduction, but likely some time in the 1960s.