Hello Stefan,
Like everyone else I would like to see a few better quality photos of your new gunong. To me the fittings do not look to be made from aluminum because of the oxidation shown in the first photo you posted, but could possibly be nickel silver or white brass instead. The hilt does however appear to be made of Tridacna shell as suggested by both David and Kai. The groove down the center of the blade I have only seen on blades dating from the 1920's and upward. If I had to guess on the age of this piece I would say second quarter of the 20th century. Better photos will help you to get more precise information from those more knowledgeable on these daggers than I am.
Best,
Robert
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