Hi Pete, A possibility exists that this strike may have been "coated" with a Flame Spraying Process. This is a method that is used in Industry to coat various metals with other metallic compositions. Metals in wire-form are fed through the small nozzle of a spray gun then a combustible gas, oxygen and compressed air serve to melt and blow the "atomized" metal against the surface to be coated. The results would be similiar to the strike you have displayed. Just a possible explanation but never the less a great oddity for your collection.......Dick Maheu in New Mexico