This antique WWII-era Swiss-made gentleman's pilot watch features a beautifully preserved, original double-register silver sector dial styled with bold black Arabic numeral hour indices, an outer telemetric track, a base-1000 tachymeter track scale, a 60-second sub-dial register at 9 o clock, a 45-minute chronograph counter at 3 o clock, and blued steel hands, signed Breitling and Swiss Made. The high-grade mechanical assembly is a manual-wind manual column-wheel chronograph movement stamped Breitling, Seventeen 17 Jewels, and Swiss, built using a premium Venus 170 caliber layout. The round watch case measures approximately 35.2mm in diameter and is finished with a 14K gold-plated bezel top, featuring square pusher operators, downturned lugs, and an exterior stainless steel snap-back cover tracking serial number 54556 alongside Fond Acier Inoxydable. The interior case back cover carries the official vintage Breitling factory script stamp alongside matching reference indicators reading 178 and 526211.This watch is running as of the time of listing, as confirmed by diagnostic performance metrics on a multi-function timegrapher logging a low amplitude rate of 131 degrees, a beat error of 0.5ms, and a variance of +21s/d. The mechanical chronograph stop-watch feature is currently not working and requires technical service or repair to operate, and extended runtime without service is not guaranteed. This item is sold, as is.