Butterfield, Bradford Thread Counter
Plated or distressed brass, featuring a small folding frame (often around 14mm to 15mm lens diameter) that collapses into a compact pocket size. Comes with small leather protective slip case.
Function: Known as a linen prover or thread counter, it allowed textile inspectors, merchants, and weavers to rest the base on fabric and quickly verify the warp and weft thread counts and weave quality
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