Masons Antiques has dated this piece to the Victorian era.
They are made by W.T.Avery and stamped with the name "J.Hare. B'ham" on the lever.
The mahogany stand has a useful opening drawer.
They are complete with a set of brass weights of 5oz., 3oz.,2oz., and 1oz.
They were possibly appothocarys scales but are suitable for all general weighing.
Masons Antiques has dated this piece to the Victorian era.
You can view the stock and full dealer information on the Masons Antiques Profile Page