Holtzapffel & Company Boxed Caliper, London, late 19th century, engraved brass instrument calibrated 0-5, and 0-50 steel knife-edge caliper mounts with sunk pan-head screws, spring-loaded, manual-driven, half-dovetailed sliding arm marked Holtzapffel & Co./London, housed in a velvet-lined, leather-bound case, instrument lg. 7 1/8 in.
Holtzapffel & Company Boxed Caliper, London, late 19th century, engraved brass instrument calibrated 0-5, and 0-50 steel knife-edge caliper mounts with sunk pan-head screws, spring-loaded, manual-driven, half-dovetailed sliding arm marked Holtzapffel & Co./London, housed in a velvet-lined, leather-bound case, instrument lg. 7 1/8 in.
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.jpg?w=400?width=1600&quality=70 "Quelle: Christie's")