photo - In this photo taken on Sept. 5, 2017, an ancient Viking sword, believed to date from about 850-950 A.D, that was found slid down between rocks on a mountain during a reindeer hunt in southern Norway, is being measured as it is displayed in Lillehammer. Archeologists believe the sword's preservation was likely due to the quality of the iron, as well as the cold, dry conditions. (Espen Finstad/ Oppland county council via AP)
In this photo taken on Sept. 5, 2017, an ancient Viking sword, believed to date from about 850-950 A.D, that was found slid down between rocks on a mountain during a reindeer hunt in southern Norway, is being measured as it is displayed in Lillehammer. Archeologists believe the sword's preservation was likely due to the quality of the iron, as well as the cold, dry conditions. (Espen Finstad/ Oppland county council via AP) 
In this photo taken on Sept. 5, 2017, an ancient Viking sword, believed to date from about 850-950 A.D, that was found slid down between rocks on a mountain during a reindeer hunt in southern Norway, is being measured as it is displayed in Lillehammer. Archeologists believe the sword's preservation was likely due to the quality of the iron, as well as the cold, dry conditions. (Espen Finstad/ Oppland county council via AP)
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