Ivory rule with single slide used by customs and excise officers. Non-linear scales on both sides. Runners for slide are wood inserts in stock. Silver bound ends.
Inscription/Sig.
"J. LONG MAKER 43 EASTCHEAP LONDON" on edge.
Fleur-de-lys on slide.
Marked for "PROOF," "UNDER PROOF," "OVER PROOF," and a "THERMOMETER SCALE."
