arguably undervalued watch probably due to its case design even though it was not produced for many years. Manual references, however, can be spotted on many of Patek;s complications like the chronographs (5070,5170,5172,7170), the perpetual calendar chronographs (3970,5970,5270), the split second chronographs (5370,5959,5950), the split second perpetual chronographs (5004,5204), the ten day power reserve (5100), the tourbillon with ten day power reserve (5101) and I probably have missed a few others.