The design stylized roses and tube lining would suggest a date of between 1890-1900. Picture 10 shows a facsimile of the impressed makers base mark as it is difficult to see without a glass and equally difficult to photograph.

Subject: Believe
Brand: Royal Bonn
Type: Lidded urn/jar
Additional Parts Required: No
Antique: Yes
Backstamp: Impressed
Colour: Multicoloured
Country/Region of Manufacture: Germany
Era: Victorian (1837-1900)
Finish: Glossy
Handmade: No
Item Height: 32cm
Material: Ceramic
Origin: Bonn
Original/Licensed Reproduction: Original
Pattern: Art Nouveau
Production Style: Art Pottery
Production Technique: Pottery
Style: Art Nouveau
Time Period Manufactured: 1850-1899
Vintage: Yes