Arabia is so collectable at the moment! These are ‘Kosmos’ espresso cups & saucers, designed by Gunvor Olin Gronqvist [or GOG as noted on the backstamp!] in the early 60s.
Kosmos came in brown, blue, and olive [as with this set.] The cups are marked ‘66’ and the saucers ‘69’, which are the catologue numbers rather than the date. It’s interesting to note that Kosmos was the first ceramic set to introduce espresso cups – previously only coffee and tea cups were produced. Perhaps there was something in 1962 that influenced Finnish people to embrace the espresso?
The espresso cups and saucers and in great vintage condition, and ready for use. They are for sale: $AU55/pair.