The six cups on the left- from the vinyl maroon case- have never been used. Each cup is wrapped in its original tissue paper, and there is a bottle-opener installed in the cap. Research leads me to believe that this set was made in Australia.
Harlequin is a catch-all phrase for multi-coloured items- many of my 50-60s collections are ‘harlequin’.
The five cups on the right where manufactured in Hong Kong [it’s stamped on the base] –and in deference to its age/Asian origin, it is a set of only 5 cups. The bottle opener is housed on the outside of the vinyl case.
Both sets have the obligatory incised rings – these are machine-turned and date the cups to the 50s- a little bit of modernist styling.
All the beakers are in fine fettle, ~ still shiny and colourful aluminium despite their age ~ I suspect they have never been near a picnic. This set is for sale: $AUD75