Germany. WWI. Charity pin in support of the German navy "The German force creates the most powerful" 1915.
The design of the sign is beautifully executed, vitreous blue and light gray enamel. The reverse is stamped "Ges Geschützt" - protected by law from counterfeiting.
The diameter is 33 mm. Fastening with a hairpin. There is a slight, barely noticeable chipping of the enamel on the rim.