Description: A very rare Audemars Piquet 4100ST. The case is 35mm although it wears much bigger than your average 35mm watch. Often referred to as the "medium-jumbo" as it shares a lot of similar visual traits. This is an automatic 2123 caliber movement. The Dial has oxidized into an amazing bronze and black swirl. The case has been lightly polished in the past but is thick and even. Bracelet has little to no stretch and the movement was just serviced by our watchmaker. Audemars did not make very many of these and we believe this is one of the very few references from AP that are made in 35mm.