Newhall illustrates a piece in his book and database as 3527 with 3528 showing no image. There is no additional Libochovice material to confirm this ID.
Jindrich has a Vaclav Zajic exhibition catalogue on his site http://www.cs-sklo.cz/
that shows this vase as 3528 and a different design for 3527.
Exhibition catalogues being notorious for muddling IDs a third source is needed to clairify the ID.
Views of 3527 or IS it 3528 can be seen here