1334 above 21 Incised

I don't know who made this one. Any thoughts much appreciated. Sunny and glossy yellow inner glaze while the external is a slightly browny black with just a hint of lustre to it. Decorative lines are incised through the glaze. Base glazed and stamp impressed mark 1334 above 21. White clay. I'm not sure if the white dot/line/dot before the number in the picture is just a scratch or is meant to be a mark.

Judging by the way the numbers are incised I would say Dümler & Breiden but the decor I have not seen on any D&B, although they used the yellow interior glaze on other pieces, but other's did too.

bump

D&B catalog about 1957 with handled vases e.g. 1324, 1342, 1344 ---
"but the decor I have not seen on any D&B" good point indeed,
D&B for sure though, identical shape with number 1334 known with D&B sticker;
identical shape was later re-numbered to 334.