ISA 8171 Analog Chronograph with 30 Minute Counter - Instructions Manual (Models 8171/201, 8171/202, 8171/204)

Instructions manual for ISA analog chronographs covering three distinct models: 8171/201 and 8171/202 (chronographs with 30-minute totalizer), and 8171/204 (chronograph with 30-minute totalizer, date window, and moonphase correction). This comprehensive owner's manual provides bilingual English/French and trilingual English/French/German operating sections with detailed procedures for all watch functions. Coverage includes time setting, chronograph operation with cumulative and split time measurements, plus date and moonphase adjustment for model 8171/204. The manual specifies battery requirements (SR 57 battery with 57-month service life without chronograph use, or 41 months with daily 1-hour operation) and includes recalibration instructions following battery replacement. Detailed watch face diagrams identify pushbuttons A and B, crown position, and subdial layout. An essential reference for owners and technicians operating these precision analog chronographs.