You will have to contact Walther for the exact date.
The PPK/s is a PP with a PPK slide.
Made in 1939.
Walther arms Ulm/Donau, Germany
The Walther PPK pistol is manufactured by German small arms maker Carl Walther GmbH.
You will need to contact Walther to find out.
1931 to date
The Walther PPK pistol was first released in 1931. During that time the Walther PPK pistol was popular amongst European police and civilians because it was reliable and concealable.
I believe you are asking about a Walther PPK/S made by Umarex. I would contact Umarex directly and ask them at Customer Service. See the link below.
Someone at p38forum.com might have the data you need.
You will have to contact Walther
In the first film, Doctor No, it is made clear that Bond does not prefer the Walther PPK as his weapon of choice - he prefers the Beretta, but is overruled by his superior, M.