signed Troughton London, with -5-0-145 scale and vernier with magnifier, two sets of coloured filters and turned wood handle, lacking telescope, 10in (25.5cm) radius
signed Troughton London, with -5-0-145 scale and vernier with magnifier, two sets of coloured filters and turned wood handle, lacking telescope, 10in (25.5cm) radius
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
