Vintage retro mechanical calculator Summira 7 and a Resulta 7 from the 50s/60s. The Resulta 7 comes from Maschinen- und Werkzeugfabrik Paul Brüning from Berlin. This calculator was originally called Minerva, but the name was changed to Resulta in 1930. Production stopped in 1943 due to bombardments, but resumed from 1950. The Summira came from former West Germany and was designed by Paul G. Müller in his Büromaschinenfabrik in Frankfurt, it was made until 1953. The Summira 7 is a larger version of the well-known Resulta version, it has a separate display for input. This calculator has the original case. Of course characteristic of that time is the industrial steel hammered look and feel. Resulta 7 = 15 x 11 x 11 cm and 1.4 kg Summira 7 = 13 x 13 x 19 cm and 3 kg Serial number Summira: 62992 Both well packaged and posted by registered post.