US Navy Chief Boatswain's Mate (BM) CPO insignia pin; two‑tone design for uniform collar/lapel wear with double clutch backs.

Front shows a silver U.S. shield with stars and stripes over a gold fouled anchor, topped by a Boatswain's pipe specialty mark inside a roundel.

Color/Material: Gold‑tone metal with silver‑tone shield accents.

Back stamp: V-21 CO; dual pin posts with butterfly clutches.

Details: Two-post clutch closure, detailed relief, collectible military insignia piece.