The makers' initials,'esb' are for e. The little pot was assayed in birmingham, however, the date letter's' is almost identical for 1917 and 1942. Barnsley & co was most active between the 1880s-1920s, i believe this little pot dates to 1917. This puts it in the reign of george v, the year of the battle of vimy ridge in ww1, and this was also the year of the russian revolution.
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This item is made of glass and sterling silver.