Plain Sunrise / Sunset Mark - Gebrueder Heubach

I received an enquiry in regards to a plain printed green circle mark, displaying a sunset or sunrise, on the base of a dog figurine.

This back stamp belongs to a company called “Gebrueder Heubach”. Their porcelain manufacture operated in Lichte, Thuringia, Germany and was founded in 1820. Heubach is mainly known for its famous dolls, which are highly collectable.

A similar mark (including SCHUTZ – MARKE, = Trade mark, meaning basically copyright)  was registered in Berlin in 1895. They used another sunrise mark with DEP underneath from 1882-c1905. Source: Zuehlsdorff  (1994), Keramik-Marken Lexikon, Arnoldsche, Stuttgart / Germany, p.  (Mark number 1/15.18).

The company used a different mark after the war, see http://bodenmarken.porzellan-selb.de/porzellanmarken.php?page=3

I think its save to say the dog was made in the early 20^th century.

Does anyone know in which time frame this particular mark was used?