Just to point out that, for anyone who uses Simon Cottle’s “Sowerby – Gateshead Glass”, 1986, ISBN 090597427, for research or reference, that there is an error on page 100 regarding the date of the first batch of 1878 registrations:
Cottle assigns a registration date of 20 January 1878 to a parcel of 7 registration numbers – 318789 to 318795. The registration date should, in fact be 20 FEBRUARY 1878 [Parcel 3].
The registration dates for this Sowerby registration parcel are correct in Thompson, Slack, and at
http://www.great-glass.co.uk/glass%20notes/lozenge5.htm