As everyone who has access to the lists of Registrations will know, Sowerby Registered six designs, with the Board of Trade, on this date - Nos. 333424 to 29.
Obviously, just looking at the list of Nos. doesn't help us to know to which of these Roy's handled bowl belongs - which is possibly why it's not included in his post.
My Kew pix for all six designs for this date are good apart from the last one which is slightly blurred, and I'm annoyed that I hadn't noticed this at the time of taking the photographs, so have decided not to publish on the Board and will wait until I visit Kew again and will then take a better picture. However, there's no doubt that this bowl belongs to Rd. 333429, since the shape and unusual, slightly supported and elevated handles, all agree with the Board of Trade drawing.
very desirable find Roy.