Square-shaped coin consistent with a 1977 Netherlands Antilles 2.5 cent piece

This item appears to be a square-shaped coin with rounded corners, consistent with coinage issued by the Netherlands Antilles. The face shown features a coat of arms topped with a royal crown, surrounded by the text "NEDERLANDSE ANTILLEN" and the motto "LIBERTATE UNANIMUS". The date "1977" is clearly visible at the bottom of the strike. Based on the visible markings and the characteristic square shape, this is highly consistent with a 2.5 cent denomination typically minted in a copper-nickel alloy. On either side of the date, there appear to be small mint and privy marks, consistent with those used by the Royal Dutch Mint (the cock and Mercury's staff). The surface shows signs of circulation including fine scratches, surface dulling, and edge wear, particularly around the corners. The metal has a matte gray appearance, suggesting a base metal composition rather than precious metal. Identification is based on visual examination of the markings and shape, though physical metal testing and weight verification would be required to rule out contemporary counterfeits or reproductions.

Based on the image provided, I have examined this square-shaped coin which bears markings consistent with a 1977 Netherlands Antilles 2.5 cent piece. I can observe a coat of arms, the motto "LIBERTATE UNANIMUS", and mint marks that align with the Royal Dutch Mint. However, I cannot verify the metal composition or weight from a photo alone; physical inspection would be required to rule out contemporary counterfeits or plated base-metal reproductions. The surface shows signs of significant circulation, including surface dulling and wear on the corners, which typically places a coin of this type in a lower numismatic grade. The valuation is based on the assumption that this is a circulation-strike copper-nickel coin. Because millions of these were minted, they are common in the numismatic market unless found in pristine, uncirculated condition. The current estimate reflects the typical market value for a circulated specimen of this specific year and denomination. If the item were proven to be a proof strike or possessed a rare minting error not visible here, the value could increase slightly; conversely, if it is a modern replica, it would have negligible commercial value. To confirm the status of the item, an in-person examination by a numismatic expert to verify its weight, diameter, and edge profile against official mint specifications would be necessary. Generally, market demand for mid-20th-century Antilles base-metal coinage remains steady but modest among world coin collectors.