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I sometimes find objects that only have "800 XX" or "900 XX" where the "X" represents a letter ::: When I research these marks, the best we can come up with is "European Continental" so the best guess would be Swiss or Belgium or Austria ::: If there are no other hallmarks whatsoever, I think this is the best I can come up with ::: Maybe another person can say something helpful, but I just know it is Continental Europe, but I know this doesn't narrow it down very much :::