Nestler 0281 Geometer 400°

Country of manufacture: Germany,            Date of manufacture: ____
Overall length: 29.7 cm,          Width: 3.8 cm,           Overall Thickness (including cursor): 1.4 cm,          Weight: 92.6 gms
Materials: Closed form simplex; celluloid lamimate over wood
Cursor: 4.2 X 3.5 X 1.3 cms; metal framed glass lens; plastic indicator on bottom edge;   lines = 3 lines on front.
Scales: 13, extensions on D, sin*cos, C, D
Front: 27 cm // L, D [ sin*cos/cos2, ST (for sin*cos scale), C ] D, B || K, BI
Slide Back: S, ST, T
Well: blank
Gauge Marks: [C, π, ρ'', √, ρ,, ]
Back: (German) Mathematical Constants & Conversion Factors; Instructions for use.
Condition: C4-C5 (Signs of Minimal to Normal use). Previous owner has pasted a paper scale over part of the 27 cm scale on the top edge.
Came with: Dark blue plastic clamshell case