Japanese Artillery Simplex Slide Rule

Data:

• Brass slide rule with glass cursor and leather case
• 0.6 cm × 28 cm × 3.1 cm
• Note: The PowerHouse Museum link on the NMAH web site should read https://collection.powerhouse.com.au/object/384855

Question:

1. Maker?
   If it is solid brass (not clear from image) it can be found in the ISRM Military Gallery – unknown maker but listed as circa 1939-1945. Part of Tom Dilatush’s collection with extra information. David Rance