OMO was a well known brand of washing powder, later replaced by Persil, and now part of the Unilever group.
This lovely set of brightly coloured vintage plastic pots was issued in Holland during the 1960s as advertising for the OMO washing powder. The vibrant colours of the pots with images of children playing, were meant to reflect the bright colours clothes would retain when washed in OMO! Sold as a set of six pots.
The pots are stamped on the bottom OMO, and have the Dutch makers stamp Bema NV.