Hello Detlef,
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I doubt that it was ever silver plated. And the only way I am aware to silver-plate aluminium is electroplating. And I don't think that it was a used technic to this time.
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Maybe we rather have to adjust the estimated time frame?
Have a look at pic #14 (the tip/finial fixed with the copper nails): This looks like 2 metals to me and any other metal plating on aluminium is even more unlikely IMHO. Quality gunong have been produced throughout the 20th century, and contrary to many other ethnographic blades quality is not per se correlated with age. The dagger certainly seems to have some age - I don't have any data on the earliest examples of this style though. Maybe just the scabbard got replaced later? (Craftsmanship of the scabbard does look a bit subpar compared to the dagger IMVHO.)
Regards,
Kai