nice bowl Tim and a good find - regret not my area so unable to help with anything useful as to origin or age. Whilst I understand what is being implied here by the term art deco, it's well to remember that this term refers to a particular style or design rather a period, and I appreciate that your description doesn't suggest this bowl is c. 90 years old

Something made yesterday may just as correctly be described as art deco as a some of the most iconic Lalique or distinctive angular furniture from the late '20s or '30s.
I could be very wrong, but imho this piece appears to have an ogee outline to the shape and doesn't come across as particularly deco in style, or at least it may have been a shape used far less commonly than others during that period.
I hope that you get an id eventually.