The Antony Cribb sale in Oxfordshire on November 9 produced two.
A Manton-type flintlock powder tester sold for £660. In the days when gunpowder manufacture was far from standardised, this handy method of assessing the actual force of a known charge was a big step towards consistent accuracy.
Pictured above is a late 16th or early 17th century German wheel-lock spanner which sold to an online bidder at £90.
Without a spanner to wind the mechanism which rotated the serrated wheel against the sparking flint such weapons were useless, yet few wheel-locks are now to be found with their original keys.