This is a carbide lamp manufactured by Isomura Sangyo Co., Ltd. from the early Showa era to the 1960s. At the time, there was a demand for small, lightweight models that were easy to carry for long periods. "Mitsubishi" is the Isomura trademark, and three diamond shapes are engraved on it. A carbide lamp is a lamp that emits light by burning acetylene gas, which is generated by the reaction of calcium carbide and water. Its vivid and unique color is popular among retro enthusiasts. Carbide can be easily purchased at fishing tackle stores. For this listing, a combustion experiment was conducted. Although only a small amount of carbide was used, it burned for over 2 hours, maintaining sufficient light even today, across the ages. Looking at the light, I was reminded of a fantastic scene from a snow camping trip. Dry weight: 870g Dimensions: Bottom diameter 10cm x Total height 17cm Lens section: Diameter 10cm x Length 8cm The carbide stones in the photo are not included.