MINERVA antimagnetic wristwatch with calibre 49, manual winding, Switzerland around 1955, chrome-plated metal case, screwed down stainless steel case back, silvered dial with Arabic luminous numerals due to age spotty/patinated, blued steel hands, indirect sweep seconds, 17 jewels, calibre 49, screw- balance, flat hairspring, incablock shock- absorber , diameter approx. 30 mm, condition 2, property of a collector