and who are we to argue with the experts at Broadfield House

- looks as though you're right about age at least then. Still think you should show yours to the museum - they may well be able to help with additional information - I used to do the same with the V.& A., and they were always helpful.
Am still of the opinion that the underside decoration is unusual - I wonder if it's an Irish thing - and would still question the desert use, although perhaps more from the Regency end of the period.
It's a habit thing, this suspicion - so many of the earlier styles and decorative features have been copied - the first thing I do is assume it's not, and then work along the lines of trying to prove it is............. less of a let down that way - when it turns out to be later.
And of course not easy with some of these pieces, when only looking at the screen.
the tops look to be a slightly scaled down version of Van Dyke rims.