A delicate and beautiful Viking comb!  This piece could also hold a fire striker, or you can provide your own comb
2 15/16” x 2 7/16” (7.3 x 6.1 cm) with comb attached, 2 15/16” x 1 1/2” (7.3  x 3.9 cm) with no comb
Viking - Comb from Vendel, Sweden.   A plastic comb is used for the comb teeth.