76. 76Y A. Lange & Söhne. An 18K rose gold manual wind wristwatch with power reserve indication A. Lange & Söhne. Montre bracelet en or rose 18K (750) avec réserve de marche mouvement mécanique Model: 1815 Auf und Ab (Up & Down) Reference: 221.032 Date: Circa 2007 Movement: 27-jewel Cal.L942.1 manual wind, adjusted to 5 positions, No.26881 Dial: Silvered, black Arabic numeral hour markers, black outer minute track with five minute markers, subsidiary dials at 4 and 8 for seconds and up/down register, gilt dagger hands Case: Polished round, exhibition back secured by 6 screws, No.139443 Strap/Bracelet: Black A. Lange & Söhne alligator leather Buckle/Clasp: Signed 18K rose gold buckle Signed: Case, dial & movement Size: 37mm Weight: 66,00g Accompaniments: A. Lange & Söhne box, outer card, Certificate and Proof of Origin document, Guarantee & service brochures, Instructions manual, cloth The German name of this Lange is "AUF and AB" in accordance with the inscription on the power reserve indicator. When the hands point to "AUF", the mainspring of the watch is fully wound. When the hands point to "AB", this warns the wearer that the watch needs to be rewound. The UP and DOWN display has a long tradition at Lange and Söhne, as seen in their pocket watches, marine chronometers and finally in their "Pour le Mérite Tourbillon."