Riihimäki vases: unknown designer and Nanny Still

All of these five vases are Finnish and were produced by Riihimäki. The three on the right were designed by Nanny Still in 1965 and are catalogued as model No.1351. They came in different colours and four sizes: 16, 18, 22 and 28.

The two on the left are also Riihimäki -the blue one bears the Riihimäki sticker from the time- and stands 22 cm. tall... BUT the don't belong to the model No. 1351. If you look at the base, it's different, as is the ring which in this case is pretty wide.

They say that whenever there is an unknown design from this time they attribute it to Tamara Aladin, but my guess is that it is an Aimo Okkolin design but so far I've found no information about it.