This is a post-war commemorative item made to commemorate veterans of the 9th Railroad Regiment who came home after the war. The item itself is a railroad spike made of what looks to be copper. The words on the spike itself as "Thailand-Burma Connection Railway Completion Commemoration" "Showa 18th Year (1943) October
Thailand-Burma Rail Link Souvenir Medallion
Thai-Burma railway
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The Men of SOE Burma – The Special Operations Executive in Burma 1941-1945
Why did Thailand do so poorly in the Franco-Thai War against France? They had to be saved by Japan. - Quora
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Thai-Burma railway
Japanese Military Commemorative Sake Cups, Bottles, and other items – Imperial Military Sake Cups
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Very Rare Japanese Army Burma - Thailand Railway Completion Commemorat – Imperial Military Sake Cups