Calendar with weekdays, feastdays, and St. Olav Axes.
"MS in Norwegian on walrus bone or reindeer horn, Norway, ca. 15th c., 6 ff., 3x14 cm, single column, (2x14 cm), 1 line in runes of the younger futhark, 93 feastday symbols in a rather early primitive stage, including the 2 St. Olav axes.
Binding: Norway, ca. 15th c., walrus bone or reindeer horn covers, fastened with 2 leather straps through holes.
Commentary: The 2 St. Olav axes, 29 July and 3 August, represent the most conclusive evidence of Norwegian origin. Calendars in bookform on bone are of the utmost rarity. This is the only specimen in private hands. Runes are normally used for weekdays and golden numbers in Swedish calendars. In Norway they occur very rarely.” (via)