Have you noticed it's partially cased? The top of the casing does not blend into the neck.
These trial ranges were more complex than the ranges which eventually went into production proper.
There are, as I said earlier, different versions of pink and blue swirls, but I don't personally consider them to be actually different, just variations on the same theme.
This one of yours has much wigglier "swirls", they're not just spirals around the body. It has elongated big vertical bubbles and a slightly oily look, with tiny bubbles too, and, as Anton says, the colours are quite deep.