This grower is sure of this plant identification.
Established plant in 6cm pot. This may be Gasteria marmorata variegata, but not sure.
Only some leaves show the yellow variegation.
Lawyer's tongue, Dutch wings
Gasteria genus (Lawyer's tongue). This genus will consists of perennial succulents they are grown for their interesting bell-shaped spiked flowers and dotted lance-shaped leaves which can form a rosette or fan shaped making them useful for the rock garden or containers.
They are frost tender, min 5C, It is easy to grow and will need a sunny position or partial shade in very well drained soil.
Flowers and foliage.