Mr Henry's Patent Balance & Gauge

English, c.1780, the base stamped 'S. HENRY INVENTOR' below a crown, the balance with swing out steel coin gauge with a stamp for 'GR' (Gerogius Rex) below a crown, the balance in a fitted sharkskin covered case with red silk lining and instructions to base,

Note for a similar scale see science museum https://collection.sciencemuseumgroup.org.uk/objects/co58002/guinea-balance-and-gauge-by-s-henry