• 手動上弦鍍銅機芯178，17顆寶石 • 黑白雙色錶盤，阿拉伯數字，外環分鐘及秒數刻度，小錶盤顯示秒數、30分鐘及12小時計時，夜光條狀指針，時針每24小時旋轉一圈 • 精鋼錶殼，琢面錶耳，錶圈設24小時刻度，旋入式錶背蓋 • 錶殼、錶盤及機芯印有品牌標誌
* 拍品資料以英文圖錄為準。

Universal’s Aero-Compax began its run as a four-register chronograph, and evolved into the present reference 890101/01 as a standard three-register chronograph with a 24-hour dial. The chronograph was offered with three different dial colors: black, white and the present two-tone black and white. The bezel for the monochrome dials featured a two-tone bezel to differentiate night and day for the 24 hour dial and second time zone, whereas the black and white dial version was a single brushed finish, as seen on this example. The model was also offered with a 12 hour dial with a caliber 130 inside, and the present 24 hour example features a caliber 90 with a 30-minute chronograph register, jumping every minute in contrast to the examples featuring a 15-minute register (which jump in 30-second increments). Additionally, the present lot is offered in unpolished and original condition, retaining the facets to the lugs and the reference and serial number engravings to the case back.