Old German badge 1955 ADAC Backnang rally Plakette plaque Porsche Mercedes #257

Very attractive German car badge, old and rar:
Allgemeiner Deutscher Automobil club
International Neckar Rally, Backnang - Stuttgart 1955

High quality / Very fine master craftsmen work
 Relief badge /  Town coat of arms from Backnang
Porcelain enamel, fire burned
Very massive, brass-copper, 100 grams / 80 mm ⌀ (3,2")
Excellent condition, no damage, never mounted
A vintage, beautiful German badge of a collection resolution