An antique treen boxwood double measure of a small size. It only measures 5.6cm h x 2.1cm w at the smallest cup end and 3.1cm w at the biggest end.
These antique apothecary measurers, made also in silver and pewter were made in different sizes and sometimes have numbers stamped on them the largest being 8s for eight spoonfuls and the smallest being 1s. The most common size is the 5s, the size for eggs hence the confusion but in fact the 5s was commonly used for to make soda water. The largest cup was for bicarbonate of soda and the smaller one for citric acid.