Hi, on page 219 of Millers 20th Century Glass by Andy McConnell there's photographed something similar - the Pajazzo vases designed in 1970 by Nanny Still for Riihimaki however as you say they have two sets of bumps, a quite different rim feature and also they're two coloured. The text underneath doesn't mention any made in tangerine - just yellow/olive, yellow/rubin, yellow/blue - although Nanny Still did use a bright tangerine colour in lots of her designs so it is possible ... but as I said, your shape isn't in any of my books unfortunately so I'd suggest it's a lookeylikey. It's jolly nice though, just the sort of thing I go for - bright and funky.