Ulysse Nardin Michelangelo vintage wristwatch

in steel and 18kt yellow gold, ref. 164-44 /1425, rectangular case 34x29 mm., complete calendar, silvered dial with indexes, four subsidiary dials, three in mother-of-pearl for date, days, months and moon phases, sapphire crystal, mechanical skeletal movement with automatic winding, 16-5 caliber, leather strap with original buckle, case, signed dial and movement, complete with box, guarantee and key