This design is featured in Viking Knits & Ancient Ornaments, a book from Elsebeth Lavold, and uses Elsebeth Lavold yarn including Silky Wool
On page 100, Front:
The increases at the second marker have been lost, the line should read:
Place a marker at each side of the center 30 sts and increase as follows: Edge st, k2, LLI, work until 1 st before the first marker, RLI, k2, LLI, work until 1 st before the second marker, RLI, k2, LLI, work until 3 sts remain and end with RLI, edge st.
You'll find the same error on the back, page 102.