浪琴，精細，不銹鋼腕錶，配飛返計時功能，型號7413，約1970年製

The Longines calibre 30CH is renowned among collectors as being the successor to the legendary 13ZN flyback chronograph movement. The flyback allows for the quick resetting and running with the push of 1 button rather than the 3 presses required with a standard chronograph, which is especially useful when timing multiple evens in quick succession.

The present watch is fitted with the calibre 530, part of the calibre 30CH family, as confirmed by the Extract from the Archives.