How do I clean an old glass flask?

Fill the interior with warm water and mild detergent, using a soft bottle brush if access permits. Avoid harsh abrasives on the exterior silver mounts. Dry the vessel thoroughly and leave the cap off to air the interior completely before storage.

Were these flasks meant for daily use?

Gentlemen and travellers carried them in pockets or leather cases for field sports and journeys. The durable glass and silver construction suited regular outdoor carriage. Today, many owners continue to use them for similar occasions or display them as barware.

How can I date a silver mounted flask?

British silver mounts usually bear hallmarks that include a date letter indicating the exact year of assay. Maker's marks and town marks provide additional confirmation of origin. Stylistic cues like cut glass patterns and enamel work help narrow down the period when hallmarks are rubbed.

What is the purpose of the bottom cup?

The lower metal sleeve doubles as a drinking vessel when slipped off the glass body. It allowed the owner to pour and share a dram while away from home. Many surviving pieces retain this original fitted component, which screws or slides onto the base.