This rare Swedish naval dirk or Sven ska SØmandsknive was made by the well-known Eskilstuna knife-maker Gustaf Johan Berg, and is marked G.JOH.BERG on the blade recess and the scabbard. Blade measures 8 cm. in length, and shows signs of honest wear. Scabbard is very nicely made, with cut-out decorations in the form of the crown, crossed swords and a fouled anchor. I've attached period photos of two Swedish sailors carrying this type of knife.
A nice, very uncommon mid-19th c. Swedish naval knife!