This Swedish practice grenade could easily be mistaken for a German practice grenade. There is only a small difference in the way the head is constructed. Compare the pictures below, left is Swedish, right is German.Photo © Francesco Zanardi
Photo right shows the practice fuze for the grenade.This fuze was also used with the Övningshandgranat M/43.Photo © Jörgen.
Steel head version of the grenade, with original paint.Markings are "SI 4405"on the head, and "HS 1518" on the wooden stick.Photos thanks to Tom.