Are these stoppers original to the flasks?

Many flasks retain their original ground glass stoppers, which often bear matching assembly marks or grinding patterns near the base. A correct fit should sit flush without excessive wobble or sticking. Replacement stoppers occur frequently in historical barware. Examine the wear around the neck interior to determine if the current closure matches the age of the glass body.

How do I date an antique glass flask?

Examine the hallmarks on silver mounts, which provide exact assay office marks and years for British pieces. Stylistic cues such as heavy Victorian etching or streamlined Art Deco moulding also narrow the production era. Signature marks on the glass base point toward specific glasshouses or independent designers. Compare the manufacturing technique against known period styles to confirm the decade.

Can I still use these for perfume or spirits?

Most antique perfume bottles and decanters function well for modern use provided the seals remain intact. Check the ground glass fit or cork seals for degradation before filling. Store valuable or painted pieces away from direct sunlight to prevent fading. Ensure volatile liquids like perfume do not sit against fragile enamel work for prolonged periods.