Base
The base of Kreutz items is sometimes marked with numbers, these are sometimes these are clearly visible, other times they can be very faint.

Some Kreutz items are not marked at all.

Stickers/Labels
Kreutz items were marked with two labels, firstly a Kreutz sticker somewhere prominent and then a second label on the edge of the base that read handarbeit (handmade). Many Kreutz items were rebadged mainly by either Gerlach or RI – these companies bought Kreutz items and simply re-labelled them as their own to sell on.