Michel Catalogue number: 150; catalogue value €32.00 ($50.00 approx.)

Stamp Number DE 688
Yvert et Tellier DE 35
Stanley Gibbons DE 1076
AFA number DE 1114

1952, 25. Juli. 75 Jahre Otto-Viertakt-Gasmotor. Nikolaus Otto (1832-1891), Maschinenbauer; Ottomotor

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