Engineer's 1510 (same as Relay/Ricoh 151)

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Country of manufacture: Japan,            Date of manufacture: 1965 (d.c.- N.S-3)
Overall length: 35.3 cm,          Width: 4.7 cm,           Weight: 155.6 gms
Materials: Celluloid laminate over bamboo, metal end braces, adjustable
Cursor: 3.0 X 5.7 X 1.2 cms; plastic runners, metal framed glass lens, adjustable; lines = single line, front and back
Scales: 25, extensions on A, B, C, D
Front: LL-1, LL-2, LL-3, DF [ CF, CIF, CI, C ] D, LL3, LL2, LL1
Back: LL-0, L, K, A [B, S, ST, T, C] D, DI, P, LL0
Gauge Marks: [π, e, 1/e, ρ'', ρ', ρ^o, C ]
Condition: C4-C5 (Minimal to Normal signs of use), except prior owner replaced cursor with (probably) a Hemmi/Post Versalog or similar one.
Came with: Original brown leather case, imprinted 'Engineer's 1510'

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