|Note_en={{Dating|guess}} stand for '50s half. Advertising for the [[Onoto K]] models, in the four version ''"K1"'', ''"K2"'', ''"K3"'' and ''"K4"''. | |Note_en={{Dating|guess}} stand for '50s half. Advertising for the [[Onoto K]] models, in the four version ''"K1"'', ''"K2"'', ''"K3"'' and ''"K4"''. |