Accompanied by Omega 30 mm instruction booklet and blank Guarantee.
The famous calibre 30 mm. was designed by Henri Kneuss, launched in 1939 and would mark the history of watchmaking for a quarter of a century.
The chronometer version of this movement, now called 30 SC T2 RG, beat numerous records at the Neuchâtel, Geneva and Kew Observatory Contests and was considered the most precise wristwatch calibre ever tested. Calibre 30 continued to make its mark until 1967, the last year of the competitions.