Rederi A/B Poseidon (Lloyds 1953-4).

The B188/B606 flag is given as an alternative. Brown assigns B188 to both motor and steamships and links it with Disa; other sources use Brodin Line or Poseidon. Brown’s funnel circle is larger than Stewart’s. The Bryggan and FOTW attribution to O.A. Brodin may identify the wrong Brödin, since flag books give Erik O.; Rosanoski notes their apparent connections but does not resolve the identity fully.