Manufacturer: Keuffel and Esser
Country of Manufacture: U.S.A.
Type: 68 1210 Log Log Duplex Decitrig
Number: 520899
Date of Manufacture:  
Scales: (Front) LL02, LL03, DF [ CF, CIF, CI, C] D, LL3, LL2
Scales: (Back) LL01, L, K, A [B, T, SRT, S] D, DI, LL1
Number of Scales: 21
Gauge Points: π, re, e
Slide Rule made from: Bamboo and Plastic
Cursor made from: Plastic with Metal Frame
Cursor Lines: 1 front, 1 back
Overall Length of Rule: 31.7 cm
Length of Scales: 25 cm
Width: 4.1 cm
Depth: 0.7 cm
Weight: 95 gm
Acquired from: Sphere Research
Date: June 2000
Condition: Good
 Came as the complete 68-1215 set, i.e.
 Leather case.  Good condition
 Box. Medium condition
 Manual (English). Good condition