Thank you, Roy. They are the first reference photos I have for this pattern number.
For completeness, it is from Sowerby RD 314268, registered on 18 September 1877 – Parcel 7.
It is shown on page 4 of the Sowerby patern book IX (1882)
Interestingly your piece is straight-sided, whereas the pattern book illustration depicts slightly flared sides.
Paul shows the design representation in reply #3 of
http://www.glassmessages.com/index.php/topic,58115.msg329400.html#msg329400That topic also demonstrates that Cottle (page 100) is in error with his correlation of the RD and pattern numbers (along with several other errors in correlation within that particular design registration bundle).
Fred.