A rare M-130 Koralle meteorological cipher machine, Russian, late 1950's,
No. 4013, the black painted metal casing with keyboard at the front for numbers 0-9 and the letter "X" a minus sign and return key, paper tape feed above and underneath the cover to the front is mounted the crypto unit with five electrical coding wheels each with 30 contacts at either side and four additional mechanical pin wheels that control the irregular stepping of the coding wheels, complete with separate power unit, 9¼in x 17½in x 20in (23.5cm x 44.5cm x 51cm)