K&E E4081-3 Log Log Duplex Decitrig (also K&E 68-1210, 1215)

Country of manufacture: USA,            Date of manufacture: ____, Ser. No.: 321650
Overall length: 31.8 cm,          Width: 4.1 cm,           Weight: 103.0 gms
Materials: Celluloid laminate over mahogany, metal end braces, adjustable
Cursor: 3.0 X 5.0 X 1.2 cms; plastic runners, metal framed glass lens, adjustable; lines = single hairline front and back
Scales: 21, no extensions
Front: LL02, LL03, DF [CF, CIF, CI, C] D, LL3, LL2
Back: LL01, L, K, A [B, T, SRT, S] D, DI, LL1
Gauge Marks: [π, e, 1/e, 785 ]
Condition: C2 (Mint but no box)
Came with: Original leather case, instruction book