David,
You are correct that both Portugal and the Netherlands used cleaning rods of this type. The one pictured above is as Lugerdoc described, a part of a 1970s Mauser commemorative issue. The earlier cleaning rods have a much smaller cap on the oiler, and the knurling on the cap is the full height of the cap in a diamond pattern, not the square checkered row shown on the Mauser rod.
JerryB,
Unless it is really ratty, your estimate of the value of your 1906 era cleaning rod, if original, is at least $70-$100 short. There are fairly good reproductions being made now, but even those cost more than $25.
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If it's made after 1918...it's a reproduction
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