I tried to find similair examples on the web.. acording to the authors on these web pages this kind of powder tester was also in use in the 18th century, but the style differs from Fernando's powder tester and the truthfullness about these claims might be clouded by the sellers "ambition"
I did find a nice website though (pitt rivers museum).
http://web.prm.ox.ac.uk/weapons/inde...359/index.html
http://merzantiques.com/item/very-unusual-powder-tester (
http://www.icollector.com/17th-centu...ture_i11291595 )
http://www.icollector.com/Early-powd...rule_i11291691
