I'd think that your PB might have been made after the Collector's Club ones were released. It is a lovely design.
Can I assume your bottle is not signed, numbered or dated?
I have seen another colourway from the 4 seas collection, it's a lot paler and is not nearly so thickly surface decorated.
The names are all a bit confusing.
A bit more googling tells me your pb might be called Night Sea?