LEOBSCHÜTZ, 80 Pfg lilac-brown, 3 Mark dark grey-violet, 5 Mark reddish orange Steelworks and Dove of Peace 1920 on large registered letter to Buenos Aires / Argentina, double-circle LEOBSCHÜTZ 15 7 20 * * b (OS handbook No. 187.3), part arrival strike on reverse, addressed to Victor Kneitschel, publisher of legendary Kneitschel specialised catalogues, rare franking and destination, age and use marks typical of period