This striking 1966 stamp from Republik Indonesia features the Green Sea Turtle (Chelonia mydas), an iconic marine species. The design shows the turtle in motion against a pale blue background, symbolizing Indonesia’s rich biodiversity and coastal heritage. Issued with a surcharge (6+1 Rupiah), it supported social or conservation funds. The stamp also bears the inscription PENJU and displays fine artwork with a bold reddish-brown border. A must-have for collectors of wildlife, marine life, and Southeast Asian philately, this issue highlights Indonesia’s dedication to nature-themed postal art of the 1960s.