Description
User guide for Heuer´s complicated engineers watch. (11 x 15 cm, 28 pages). Circular slide rule and conversion tables (quite similar to what the Breitling Navitimer offers). In very good condition, from the seventies.
User guide for Heuer´s complicated engineers watch. (11 x 15 cm, 28 pages). Circular slide rule and conversion tables (quite similar to what the Breitling Navitimer offers). In very good condition, from the seventies.