Faber Castell 2/31 Stahlbeton

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Country of manufacture: Germany,            Date of manufacture: ____
Overall length: 33.2 cm,          Width: 4.8 cm,           Weight: 109.3 gms
Materials: Plastic (PVC?) stators and slide. Metal end braces, adjustable.
Cursor: 4.2 X 5.8 X 0.9 cms; plastic runners holding plastic lens, adjustable, removable; lines = complex; multiple lines & scales on front; 5 lines on back
Scales: 20, many specialized
Front: f_e, O_b [ x/f_e/h, x/3, M ] b, X, O_b, h
Back: K,, T₁, T₂, A [ B, BI, CI, C ] D, ST, S, L
Gauge Marks: [ π, C, ρ, (1745), C1, M (3183), 786 ]
Condition: C4 (minimal signs of use)
Came with: Original plastic clamshell case

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