Thank you for showing these, Roy. Certainly a rarity - I've not seen any examples before.
Sowerby pattern no. 1402, shown on page 8 of pattern book IX (1882). I will try and post the corresponding pattern boook illustration tomorrow.
From the registration bundle nos. 333424-333429 of 17 March 1879 - Parcel 11, but I am unable to link the precise RD no. with the pattern book no. without the design registrations to compare it with.
Perhaps Paul S. might be able to help if he happens upon this post, please?
Fred.