Nestler 21a Darmstadt 20 inch

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Country of manufacture: Germany,            Date of manufacture: ____
Overall length: 58.0 cm,          Width: 4.2 cm,           Overall Thickness (including cursor): 1.5 cm,          Weight: 205.1 gms
Materials: Closed form simplex; celluloid lamimate over mahogany
Cursor: 7.6 X 3.9 X 1.5 cms; metal framed glass lens; plastic indicator on bottom edge; highlighted index on top;   lines = 3 hairlines on front face, 1 on bottom edge; 1 on top.
Scales: 14, extensions on A, B, C, CI, D
Front: 55 cm, lg // K, A [ B, CI, C ] D, √(1-x²) || sin, tg
Slide Back: LL1, LL2, LL3
Gauge Marks: [π, e, ρ^'', ρ^', ρ_,, ]
Well: Model No. I.D.
Back: Mathematical Constants, Physical Properties, Conversion Factors
Condition: C5-C6 (Signs of Normal use but missing rear hairline windows)
Came with: black cardboard case labelled 'Nestler 24R'

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