The Manurhin IS the Walther PP series.
The last Walther PP series pistols made in Germany were made in 1945.
After WWII, Walther contracted ALL PP series pistols with Manurhin.
In the late 50's, Walther stopped having the Manurhin name stamped on the guns and had only Walther markings.
After this, Manurhin made the guns, shipped them across the German border to Ulm, where the Walther factory proof fired them, stamped "Made in Germany" on them, blued them, and sold them all over the world as "German made" guns.
To be fair, in Europe, the country where the final proof is done is considered the country of manufacture.
These little facts became public in the 70's when manufacture of the PPK/s was moved to the US.
The gun writers who for years had described the Walther PP series as "Fine German workmanship" blandly informed us that they'd always known the guns were actually made in France.
So, any and all PP series guns made in Europe after 1945 were actually produced by Manurhin in France.