Victorian illustration to download showing a picture of swan upping on the river Thames, a custom where mute swans are caught, marked and released – unmarked swans traditionally belong to the monarch, but two Livery Companies, the Dyers’ and the Vintners’, can own the swans they mark. Men from the Dyers’ Company with swans’ feathers in their hats catch swans with crooks and mark them; their skiff flies their flag.