See Forum Library ... at
http://www.vikingsword.com/vb/showth...ht=accessories for a comparison...
A nice comparison appears at
https://www.pinterest.com/pin/194147433908822536/
In my opinion these are European or from the European ...Here is a description of a very similar item ...
A FINE & RARE 17TH CENTURY GERMAN/DUTCH MATCHLOCK MUSKETEER’S ALL-STEEL ADJUSTABLE POWDER-MEASURE/CHARGER, ca. 1600: In overall fine untouched condition with smooth, deeply oxidized and dark, chiseled, steel surfaces. Retains its original, pull-out, adjustable powder-measure with a graduated and rectangular arm, its circular powder-plunger and a finely chiseled, rivet-fastened, suspension-loop with pierced decorations, at its base--- for a cord/attachment to a Bandolier. The wrought-forged and finely sculpted, cylindrical form, steel body, en suite with generally smooth, untouched, richly patinated surfaces and some forge/hammer-marks, a brazed medial seam, some scattered light abrasions and expected signs of use. The integrally forged, scoop-type pouring mouth with matching wrought-forged steel surfaces and its sides are adorned with pierced and chiseled accents. Very good, rust-patinated interior surfaces with patches of pitting and oxidation. A very early and rare 17th Matchlock Musketeer’s Powder Charger/Measure, ca. 1600. Of typical German/Dutch design with finely crafted and untouched surfaces. The interior, en suite with evident rust-stains. Overall length, 5 1/2” or 7 ˝” fully extended. For similar examples, please see H. L. Peterson’s: Treasury of the Gun” and M. L. Brown’s: “Firearms in Colonial America…”. A Very Scarce 17th Century Piece of Military/Soldier’s Equiptment.