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Speculum Metal Mirror, 1860

1860

Speculum Mirror, 1850-1870

1850-1870

Speculum Mirror, 1850-1870

1850-1870

ARG-1 Astronomical Predictor for navigational use

ARG-1 Astronomical Predictor for navigational use

Astro-compass Mark II consisting of a bearing plate and sighting device used in air navigation on adjustable feet, in carrying case (see note), unsigned

Astrocompass Mk.II

1940-1955