Quiet Street Antiques of Bath has dated this piece to the 1860s.
Very difficult to find these days. 19.5ins diameter; 7.5ins high. (49.5 x 19cms)

These measures were used by Customs & Excise Officers to check that market stallholders were not under-selling their customers. The penalty for repeat offenders was a heavy fine or even deportation to Australia!
Quiet Street Antiques of Bath has dated this piece to the 1860s.
Fine antiques at sensible prices
You can view the stock and full dealer information on the Quiet Street Antiques of Bath Profile Page