No such sn in the Walther convention
You will have to contact Walther
You will need to contact Walther to find out.
No such serial number in the PPK/S range.
1961
Dieter Marschall's book on Walther has sn data in it.
Try asking on the p38forum.com
Try the P38forum
You might have better luck on P38forum.com
Someone at the p38forum.com will probably be able to help you.
Someone at the P38forum.com should be able to help
The Walther PP with serial number 709157 was produced in 1961. The Walther PP series has a date of manufacture that can be determined based on the serial number, and this specific number falls within the production range for that year. For precise verification, consulting a dedicated Walther firearm database or historical records would provide the most accurate information.