After WWII Walther was not allowed to manufacture guns for several years. They contracted with the French firm of Manurhin to make them for Walther.
My understanding is the complete guns were shipped to Walther where they were stamped with the German writing and sold as Walthers.
Several times, Manurhin made some and put their own name on them. The last time they did this, I think Walther ended their contract and either made them at Walther or had some other company do the same thing Manurhin had been doing.
The Manurhin made guns are the equal in every respect to the German made ones. They might even be better.