1940s steel vintage Leonidas Triple Calendar Moon-phase watch

A round steel vintage Leonidas Triple Calendar Moon-phase watch. The case measures 35 mm in diameter and is numbered 581451 to the inside. The 1100 calibre movement with centre sweep seconds, is signed Leonidas with 17 Rubies. The dial has black Arabic numerals with a blue outside calendar track and day/month apertures above the centre, with a lunar aperture below. The dial is signed Leonidas above the centre.