Guy,
I don't want to argue that these lock molding are not classic, because they are, but they are also heavily worn. Look at the wear on the tang carving and even on the silver mounts. Unlike many high quality fowlers this one was really used and used hard.
So, some of the roundness to the molding corners is not how they started life. I'll bet they were sharp and crisp when new!
If you want to see one in person with a lot less wear check with Freddie Harrison at the CLA. He has an original fowler with wonderful lock mortise/moldings. He has brought it most years.
Gary