Late 70's and into the '80s, Wolfie. Post-Harris, and not MH's own design (although a variation on his themes)
I like this design. I have a pair of these stoppered bottles on the ends of my mantlepiece.
There's an image of a flange-rimmed egg-shaped one in the book, p. 53, but the colours of the image aren't good.
Some folk think this is orange and green. I see it as red and blue.
