WWII Imperial Japanese Navy DC Ammeter – Hayashi Meter, Original Condition

Step back in time with this authentic WWII-era DC ammeter, a rare piece of history from the Imperial Japanese Navy (IJN). Manufactured by Hayashi Denki Seisakusho, a prominent Japanese instrument maker during the war, this ammeter bears the official stamp of the Ministry of the Navy (“海軍省検査済計” – Inspected by the Ministry of the Navy), confirming its use in IJN operations during World War II.

Specifications:

• Type: DC Ammeter (直流電流計), moving coil mechanism
• Range: 0–5 Amperes (A)
• Rated Voltage: 600V
• Accuracy: Class 2 (±2% full scale)
• Serial Number: NO. 9615
• Markings: “T.C” and “2C” (possible model or calibration marks)
• Dimensions: Approx. 4.5 inches in diameter
• Condition: Original, with signs of use including minor scratches and paint wear, consistent with its age and wartime service.

This ammeter was likely used to monitor electrical systems on IJN vessels, aircraft, submarines, or shore facilities. Its 0–5A range suggests applications in auxiliary systems such as lighting, communication equipment, or battery monitoring—critical for the operation of ships like the Yamato, aircraft carriers like the Akagi, or submarines like the I-400 class. The rugged construction, metal terminals, and panel-mount design (with mounting holes) indicate it was built for durability in demanding military environments. A fire hazard caution label (“火元事故注意計”) on the back underscores its use in high-stakes settings where safety was paramount.

This piece is a tangible connection to the technological and military history of the IJN during WWII. Perfect for collectors of Japanese militaria, naval artifacts, or vintage electrical instruments. It displays beautifully as-is or could be restored for a pristine look. Don’t miss this opportunity to own a genuine piece of WWII history!

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