This pot de creme set with matching saucers was manufactured by Fitz and Floyd. The pattern name is "Buff Classic". The cups and lids display a slightly off-white-on-white ribbed pattern. The same ribbed design is on the edge of each saucer.
The set was manufactured in the 1980s and discontinued between 1984 and 1986. The only labels/marks on the pieces were the common paper label with the FF mark and the word Japan (see image). The sets were sold in boxes of 4. The part number was: 35/386.