Nadar died in 1910, and was in charge of the studio until 1895. His son, Paul Nadar, took over the studio in 1895 and died in 1939, but even he would be out of copyright in France, and the early date handles America. It could be considered anonymous since it's the studio of Nadar, but in any case, it's out of copyright. The most restrictive possible license, though, is:
Reverted to version as of 19:22, 2 December 2020 (UTC). First, because this is a FP, so no substantial changes are allowed after the FP promotion. Second, because Adam Cuerden is a very experienced restorator; if your changes would improve the image, Adam would have done that already; if he did not do that, these changes probably deteriorate the restoration.
