Audemars Piguet confirms that the watch movement was made in 1971, and later completed and sold in 1978 in the Caribbean to the present consignor.
Few manufacturers continued to produce grand complication watches in favor of more utilitarian pieces. Audemars Piguet committed their brand to maintaining an extraordinary level of watchmaking, and continued to manufacture highly complicated hand-finished timepieces such as the present lot, featuring a minute repeater, perpetual calendar and split-seconds complication.
For a similar example, no. 26865, see Brunner, G., Pfeiffer-Belli, C. & Wehrli, M., Audemars Piguet, Masterpieces of Classical Watchmaking, 1993, p.155.