Beautiful vase Carstens 1960's Fat washes abstract décorby Heinz Siery

Very beautiful amphora vase in excellent condition designed by heinz siery for carstens germany in the 60's. Rare abstract décor fat lava in black and light; the interior is varnished in blue/green. Signed at the base.the reference number of this vase is 698/23. Height 23cm -- diameter max 25cm -- diameter without handle 21cm.