Nonius

The Longines Nonius is a fascinating piece of 1970s Swiss horological ingenuity, originally developed for precise timing in motorsport and aviation. Its most distinctive feature is the yellow “Nonius” hand, which enables reading elapsed time to 1/10th of a second—an innovation that set it apart from other mechanical chronographs of its era. The Nonius occupies a unique niche in the Longines lineup, appealing to collectors who appreciate technical solutions and bold, period-correct design.

Key reference numbers include Ref. 8225 (steel cushion case, black dial) and Ref. 8271 (round case, silver or black dial). The heart of the Nonius is the caliber 30CH, a column-wheel chronograph movement highly regarded for its reliability and smooth pusher action. Earlier models with the original “Nonius” hand and unpolished cases tend to command higher prices, while dial condition and completeness of the unique yellow hand are critical factors in value.

When shopping for a Nonius, inspect the chronograph function carefully—replacement parts for the 30CH movement, especially the Nonius hand, are scarce and expensive. Original bracelets and signed crowns add to collectibility, but the model’s value is driven primarily by movement condition and dial originality. Water resistance is minimal by modern standards, so this is best kept as a collector’s piece rather than a daily wearer.