Coming in at an impressive 36.5 mm. the diameter was amazingly avant-garde when reference 570 was launched in 1938. This current example has been kept in excellent condition with a clear hallmark under the lug and was made right at the beginning of the production in 1942. Even more unusual is the fact that it was made in 14k gold, as confirmed by the extract another rare feature, attractive to unusual calatravas collectors.