What we can now confirm
Gilded Interior
The warm gold tone inside is vermeil (gilt silver).
This was done for practical reasons:
Protected the silver from corrosion
Ideal for pills, snuff, lozenges, or cosmetics
A sign of better-quality manufacture, not a budget piece
This strongly supports the identification as a pill/snuff/trinket box, rather than a purely decorative item.
Construction Quality
From the image:
Clean hinge alignment
Even gilt finish (light wear only)
Crisp serpentine shaping inside and out
 
We believe This suggests mid-quality commercial English silver, typical of Chester production in the 1940s–1950s
Although the Hallmarks are difficult to read .
---
Updated Identification
Vintage Mid-20th Century Chester Sterling Silver Gilt Interior Pill Box
Fully hallmarked (lion passant, Chester, maker’s mark, 925)
Vermeil interior
Serpentine rococo revival form
Likely date: c. 1945–1955
---
Value (refined)
Because of the guilt interior 
Typical retail: £50–£70
Objet d’Art sweet spot: £60
These sell well when presented as a personal luxury piece.
-
A charming mid-20th century Chester sterling silver pill or trinket box, beautifully crafted in an elegant serpentine form. Fully hallmarked with lion passant and 925 fineness mark, the interior is richly gilded — a practical and traditional finish designed to protect contents and enhance durability. Compact and tactile, this lovely personal box would originally have held pills, snuff, or small keepsakes. A timeless piece of everyday luxury, combining practical function with classic English silver craftsmanship