Manufactured by Galeazzi and Mantegazza Saronno.
The company is active from 1921 to 1923, building a chain-drive 269cc single-cylinder two-stroke model with magneto ignition and two-speed gearbox.
Galeazzi e Mantegazza Saronno ecco il significato della sigla.
La ditta GEM risulta attiva dal 1921 al 1923.
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