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SUPERB EARLY BRASS TELESCOPING SLIDING RULE - HAT MAKER'S?

SUPERB EARLY BRASS TELESCOPING SLIDING RULE - HAT MAKER'S?

$295.00 USD

Very early rule that 'telescopes' out. Likely mid to late 1700s based on the look and font. Has a different scale on the back side possibly denoting sizes? Very likely a hatter's rule. I have not seen another like it. Exceptional.