Unusual Silver Split Seconds Chronograph

An early 20^th Century Swiss thirty minute recording split seconds chronograph with unusual dial layout in a silver open face case.  Gilt three quarter plate keyless going barrel movement marker "The Winner".  Plain cock with polished steel regulator, Compensation balance with overcoil hairspring.  Club foot lever escapement.   Unusual white enamel dial with split centre seconds flyback chronograph and three subsidiaries for time, continuous seconds and 30 minute record.  Blue steel hands, gilt split centre seconds hand.  Plain silver open face case, silver cuvette engrave "Examined by Samuel Lyon Jnr - Church Street Blackpool".  Gold hinges, thumb piece, split seconds button in the band and gilt winding button for the chronograph.