The Manurhin Walther PP with serial number 342862 was manufactured in 1961. Manurhin produced these firearms under license from Walther, primarily in the 1950s and 1960s. Specific manufacturing dates can often be verified through detailed records or collector resources.
Someone at p38forum.com might be able to help.
No such sn in the Walther convention
You will have to contact Walther
You will need to contact Walther
You will need to contact Walther to find out.
You will have to contact Walther to find out.
You will need to contact Walther.
Impossible to answer without the serial number.
Dieter Marschall's book on Walther has sn data in it.
You will can contact Walther, but probably 1943-45.
You will need to contact Walther to find out.
Deiter Marschall's book has Walther sn data