I have a Speedmaster 3507.51 which has - as far as I know - a 42mm moon watch case (it is not a reduced!) and a 42mm El Primero Striking 10th. I have measured both and the cases are the same size. BUT the El Primero wears much bigger due to the bezel-less all-dial design. The watch dial is therefore very large and makes the watch look a lot bigger than the Speedmaster. I love it. It is a beautiful watch. I love both. But after wearing the El Primero the Speedmaster seems small, it takes a couple of hours to get used to again.
I can't say enough about the El Primero - it is such a great watch. Get one if you can, you will not be disappointed.
Click to expand...