Where Dublin ends and Zulu begins can be a bit of an ambiguous zone; a borderland inhabited by all manner of mild (and not so mild) eccentrics. It's also a case where a bit of research can raise more questions than remove doubts, as the oldest Zulu shapes, as it turns out, didn't really taper downward from the rim like Dublins. They just looked like they did, an illusion created by their bowls' cant and the taper present through the underside and transition. This particular Castello does have the down-turned stem and shank design of the Zulu, and just a touch of cant, but to my eye at least, the very firm shaping of the heel and lowermost portion of the bowl keeps it in Dublin territory, even if just barely.
- Eric N. Squires