Dear Ssasho0,
No it was not that silvery, neither the real one nor the model. It just looks more silvery than normal due to the lighting - silver/aluminum color retains its habit to reflect light even in mat or satin finish. So you are right, the right color in my opinion is something between silver and white, that is why I used the White Aluminum Alclad paint properly treated as previous slides show.
Good luck on your own Salmson/Otsu-1. I am sure you will enjoy it.