That sounds a bit like my thinking too. (whew

)
I'm suspecting they experimented with a few moulded shapes - the odd hexagonal one has turned up (in blue or Ming).
I've got a set of 3 short "big" textured bottles, but they're the only ones I've seen.
One in reds and browns, one tortoiseshell and one blue.
A taller (8") square flanged bottle in Tortoiseshell and a small square stoppered bottle. I suspect I may have had more earlier on.
My round tortoiseshell bottle is 13" tall.
Later on, they made these bottles a good bit taller (up to 17") and in Ming.
The diameter of Keith's bottle looks quite wide compared to my round bottle. 2"7/8th.