This is a vintage Caithness Scotland "Feathers" Art Glass Paperweight. Viewed from the top, it highlights a classic dome shape enclosing a vibrant design with controlled, trapped air bubbles.

The piece features a distinct internal pattern of flowing, feather-like ribbons of green, amber-yellow, and dark brown or black glass swirled over a translucent background, standard for the Scottish studio glass manufacturer.

The estimated market value of a standard Caithness "Feathers" art glass paperweight is typically between $20 and $40. 

Because Caithness paperweights were widely collected and produced over multiple decades, their secondary market price is stable but highly dependent on a few specific factors:

• Condition: A perfect dome surface holds full value. Fleabites, scratches, or chips on the glass significantly reduce what collectors will pay. 

• Markings: Ensure you check the polished base. Most authentic examples will feature an etched inscription detailing "Caithness Scotland", the design title "Feathers", and sometimes a limited edition code or creation year (such as 2001 or 2006) which can occasionally lean toward the higher side of the price range. 

If your piece happens to be a rare "Artist Proof" or part of a strictly limited boutique run rather than the standard collection, it could potentially fetch closer to $55 to $65 on platforms like eBay or Etsy