Hope you'll be able to find some elements on our Patek Philippe forum. I don't know if there is such website, listing all Patek's references available on the net. Most of the work which has been trying to make an overall view of Patek's collection is main
27SC is NOT autowind. there are a number of models which carries this particular movement. the most famous being ref 570. but overall, i like 27sc center seconds movement, not easy to come by. ref 565, 570, 1491, 2457, 2555, 3504, 3411, 2460, 2533, 2508,
1. 12 SC is not the 1st PPC sweeps seconds mvt but it is the 1st one made in series 2. It is a 12 120 mvt given to V.Piguet for the sweeps mechanism work to be added on until 27 SC (100% PPC)launch in 1949 3. We are talking about a 60years old caliber, so