The company was established 1888 as the "Nippon Oil" (日本石油, Nihon Sekiyu), or "Nisseki" (日石) for short. In 1999, the company merged with and absorbed the former "Mitsubishi Oil" (三菱石油, Mitsubishi Sekiyu). The merged company was called "Nippon Mitsubishi Oil" (日石三菱, Nisseki Mitsubishi) until 2002, when it adopted its present name ENEOS Corporation (ENEOS株式会社).
Nippon Oil Corporation Badges/日本石油株式会社章
20 Years of Service Badge.
Size 21 x 13 mm.
Thickness 2.9 mm.
Obverse
Japan Oil /日本石油/ Nippon Oil/ emblem
reverse
20年勤続章 - 20 Years of Service Badge
Badge was made by Tomei workshop https://asiamedals.info/threads/badges-labels-and-marks-of-tomei-badges-tomei-kisho.23152/ and marked with Tōmei and 純銀 - pure silver marks
Size 21 x 13 mm.
Thickness 2.9 mm.
Obverse
Japan Oil /日本石油/ Nippon Oil/ emblem
reverse
20年勤続章 - 20 Years of Service Badge
Badge was made by Tomei workshop https://asiamedals.info/threads/badges-labels-and-marks-of-tomei-badges-tomei-kisho.23152/ and marked with Tōmei and 純銀 - pure silver marks