It's a lovely find. The catalogues only show this pattern as a 'Table Bowl', i.e. without fittings. The trade price for the bowl alone was 30 Shillings, so add a retailer's mark up and the cost of the fittings and you can see that, as Sue said, these were very pricey items when new.
They are quite scarce, but I've seen a few over the years. Opalique examples are very hard to find.
There are at least three other lighting bowl designs from Jobling you can look out for. The Bird Pattern Lambton Bowl which was registered at the same time as the roses bowl (Nov. 1933) as well as the Iris pattern and Mermaid patterns introduced in the 1940s.