Nice piece, Roy.
There were only 2 Sowerby registrations for 23 February 1877 - Parcel 8.
RD 307957 (candlestick Sowerby pattern 1196, your photo reference of which I already have), which this creamer patently is not.
RD 307958 (which Thomson and Cottle both describe as a "fluted bowl"), so this is probably a creamer to match a fluted sugar bowl (or even other parts from a suite with similar decorative features). Unfortunately, I can't so far match it with any of the pattern numbers from the extant Sowerby pattern books.
Does anyone have photos of any other pieces that might match this creamer, Please?
It will be interesting to see if Paul has the design representation for RD 307958.
Fred.