A brass art keychain from The Hakone Open-Air Museum, sold around the 1970s-80s. This keychain features a unique design inspired by abstract sculptures and is an early original model, no longer available in the museum shop. The back is engraved with "THE HAKONE OPEN-AIR MUSEUM." 【Details】 ・Era: Circa 1970s-80s ・Material: Brass (antique bronze finish) ・Size: Approximately 10cm in length ・Condition: Natural oxidation due to aging, in excellent condition 【Rarity and Value】 ・Early, limited-edition model sold only at the museum, with very few available on the market. ・Popular overseas as an art and modern sculpture motif. ・Expected to increase in value by 25-35% in the next 5-10 years, making it a stable asset. This is a perfect item for museum goods, Showa retro, and modern art goods collections. Vintage Hakone Open-Air Museum Keychain – Brass Modernist Sculpture Design – 1970s Japan Art Souvenir Rare This is a vintage keychain from The Hakone Open-Air Museum (Japan), crafted in solid brass with an antique bronze finish. It features an abstract, modernist face design inspired by the museum’s early open-air sculptures from the 1970s–1980s. The back is engraved “THE HAKONE OPEN-AIR MUSEUM.”