Manufacturer: B.R.L. Country of Manufacture: England Type: Radiac No. 1 Number: 6665-99-911-0060 Date of Manufacture: ~ 1966 Scales: (Front) 3 for Land Radiation, 3 for Sea Radiation Scales: (Back) Instructions Number of Scales: 3 + 3 Gauge Points: Slide Rule made from: Plastic Cursor made from: No cursor Cursor Lines: Overall Length of Rule: 12.7 cm Diameter Length of Scales: Width: . Depth: Weight: 13 gms Acquired from: Julien Dompierre Date: July 2002 Condition: Good Accessories: Plastic case. Good condition Comments: Two rotating inner discs.