Following above photo of "Neznani junak", accidentaly I found in a much larger photo an interesting detail. (Photo posted on "Nase sidro" forum).
In my opinion, left ship with letter "M" on funnel -- represents finance ship "Kraljevic Marko", as there were only two of its kind.
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Lako za Kraljevića Marka. U prvom planu je Veljko. Kasniji Felice, Pirat. Felicio.