That appears to be a vintage silver-tone Crown Trifari lapel stick pin featuring a polished trio of soaring birds.

This specific piece is valued around $10 to $25.

Value Breakdown

• Market Status: This item is an authentic vintage Mid-Century Modern Crown Trifari "Trio of Birds in Flight" (Seagulls) silvertone lapel stick pin. Authentic, identical signed versions of this design regularly list and sell on secondhand markets within the $12 to $25 range. 

• Condition Factors: Because the hallmark is hidden under the solder or worn away, and the copper base metal is beginning to peek through the silver plating on the edges, it sits on the lower end of that spectrum ($10–$15).

• Collectibility: While it is a costume jewelry piece rather than precious sterling silver, vintage Trifari pieces are still highly collected for their classic mid-century aesthetic and durable construction.