Gunthermann began producing mechanical toy cars in Nuremberg in 1898 and also a number of comic and character tin wind-ups in the early 1960s.
When the founder Siegfried Gunthermann died in 1890, his widow married Adolph Weigel. Toys from that period on bore makers mark with a shield inside circle and initials A.S.G.W. Wiegels initials were removed following his death in 1919.
The company was acquired by Siemens in 1965.
What's your 'Gunthermann' worth? Here are some recently sold items (USA):