It could plausibly be a piece by Cenedese for a third party company. I've had some items in the past bearing 'Cenedese' + 'random name' - especially with lighting, where they provided the glass parts for lighting firms, but also a vase that was sold exclusively through a high-end Italian bathroom fittings company. I ended up not buying them, but I was once a little tempted by a small job lot of Cenedese bathroom sinks (with fantastic colourful spiral canes!) that I think also had this pattern of signing.
It will probably be from the 1990s at the oldest.