Alex
Posted January 2, 2018 - 1:18am
Dear Tracyellen, Beautiful watch it is with nice intricate engravings even on the sides! The watch is the 6716 that later in 1925 got a name: Princine. The 6511 that admin refers to was not perfectly rounded, you can see edges in the curves of the sides and as a result used the cut corner 6TA movement and not the oval 6PP like your model. A remark on the serial number, you say it is 309 355. When you look closely, you will find there is a number 1 before the 3, so the full serial number would be 1309355. Have a look and let us know! So, in conclusion, based on serial numbers and date code: 6716.