Vintage could be older hip flask with leather top detachable guilt drinking cup this lovely item unfortunately has no Hallmarks to date probably silver plate but have to sell as white metal very nice quality item with the engraving S .A.V 12 cm tall 7 cm wide 3 cm depth some age related wear 
Hip flasks evolved from early, simple forms like gutted fruit husks to the sleek, stylish designs we know today. The earliest hip flasks were used for carrying and concealing alcohol, particularly during the 18th century when women would smuggle spirits onto British warships. Over time, they became a symbol of status and refinement, often engraved and personalized, and are still gifted as meaningful keepsakes. 
Here's a more detailed look at the history:
Early Forms:
Gutted fruit husks were among the earliest forms of hip flasks, used to store alcoholic drinks, according to Wares of Knutsford. Pig's bladders were also used as makeshift flasks, as noted by UK Hip Flasks. 
18th Century:
Silver, pewter, and glass flasks began appearing in the 18th century, often with curved, thin designs for easy concealment, says Wares of Knutsford. Women would smuggle spirits on board warships using flasks concealed under their clothing. 
Prohibition:
Hip flasks gained popularity during Prohibition as a way to discreetly carry alcohol when it was illegal to drink in public, notes UK Hip Flasks. 
Evolution and Materials:
Hip flasks evolved from simple, practical tools to fashionable accessories, often engraved or personalized, according to Bumbletree. They were made from various materials like silver, pewter, glass, and later, stainless steel. 
Modern Usage:
Today, hip flasks are still used for carrying alcohol, but they have also become popular as gifts for various occasions, according to Bumbletree. They are seen as a symbol of sophistication and adventure.