A very rare and complete Japanese educational mineral and rock specimen set, produced by the Teikoku Mineral Teaching Materials Company (帝国鉱物教材社) in the early Shōwa period (ca. 1930s, pre-WWII). This boxed set was intended for use in elementary school science classes (grades 4–6), teaching children about geology, minerals, ores, and fuels. Each compartment contains a numbered sample, corresponding to the printed index inside the lid, which lists the name, place of origin, properties, and uses of each specimen. Dimension: Approx. 30 cm × 22 cm × 4 cm. The set includes over 40 different specimens, such as: - Quartz (水晶, Suishō) - Calcite (方解石, Hōkaiseki) - Sulfur (硫黄, Iō) - Chalcopyrite (黄銅鉱, Ōdōkō) - Coal (石炭, Sekitan) - Hematite (赤鉄鉱, Sekitekkō) - Granite (花崗岩, Kakōgan) - Biotite (黒雲母, Kuro-unmo) - Sandstone (砂岩, Sagan) - and many others, some preserved in small glass vials. Condition: - Original box with printed reference charts inside the lid. - Specimens are complete and numbered, showing expected signs of age. - Paper shows wear, staining, and some foxing consistent with its 90+ years of age. - Box covering (faux reptile pattern) intact with some edge wear. They are highly collectible as both geological teaching sets and historical artifacts of Japanese education. A rare opportunity to acquire a genuine pre-war Japanese mineral specimen collection. Method of Shipment FedEx or Japan Post NOTICE The lot will be carefully packaged and shipped by FedEx or Japan Post. Delivery usually takes 1–2 weeks. Sometimes Customs or the delivery company in your country may contact you by phone or email for clearance. Please make sure you are available to respond. If not, the parcel may be returned to me, and reshipping will cost more than twice the original shipping fee. I appreciate your cooperation.