A historically significant Spanish copper 16 Maravedís coin dated 1664, struck during the reign of King Philip IV of Spain (Felipe IV, r. 1621–1665), representing mid-17th century Habsburg Spanish monetary circulation. This substantial bronze issue reflects the complex fiscal and imperial structure of the Spanish Crown at the height of its global influence across Spain, Naples, Sicily, the Spanish Netherlands, and the Americas. The obverse presents a right-facing armored and draped bust of Philip IV, with the surrounding Latin legend identifying the monarch as “PHILIPPVS IIII D G,” denoting “Philippus IV Dei Gratia” (Philip IV by the Grace of God). The portraiture is characteristic of late Habsburg numismatic engraving, showing a stylized profile with pronounced facial features and period collar detail. A beaded border frames the design, consistent with 17th-century Spanish mint production standards. The reverse displays the crowned Spanish coat of arms, quartered to represent Castile (castle), León (lion), Aragon (vertical stripes), and other Habsburg dominions, enclosed within a circular legend referencing “HISPANIARVM REX” and associated royal titles. The shield is surmounted by a royal crown and enclosed by a beaded rim, reinforcing its official state authority. The denomination of 16 Maravedís formed part of Spain’s copper-based small currency system, widely circulated within mainland Spain and its colonial territories, particularly in commerce tied to Seville and Madrid. Dated 1664, this issue belongs to the later phase of Philip IV’s reign, a period marked by monetary debasement, fiscal strain from prolonged European conflicts, and adjustments in copper coinage standards. The Maravedí denomination played a central role in everyday transactions throughout the Spanish Empire, serving as foundational small change in both Iberian and overseas markets. The coin exhibits natural aged patina consistent with 17th-century copper alloy, showing multitone surfaces and historical wear appropriate to circulated examples. Preserved in an individual holder, the piece offers clear visibility of both portrait and heraldic detail, enhancing its numismatic research and display value. This curated Spanish 16 Maravedís 1664 coin represents an authentic example of Habsburg-era Spanish copper currency, appealing to collectors of early modern European coinage, Spanish Empire monetary history, and 17th-century royal portrait issues. Its combination of clear date, identifiable monarch, and full heraldic reverse makes it a strong representative specimen of Philip IV Spanish numismatics.