The Walther P1 is an aluminum framed, post WWII version of the German P-38. They not as collectable, or as valuable, as a P-38. 100-1000 USD
5000$
You will need to contact Walther to find out.
Rupan sansei Walther P38 - 1997 TV is rated/received certificates of: USA:PG (DVD rating)
Neither, it is a Walther.
250 or so
1961
Two. Walther and Mauser
Yes.
Dieter Marschall's book on Walther has sn data in it.
P what? P38, PP, PPK. Could be worth 100 dollars or could be worth 10000 dollars depending on EXACTLY what it is and condition.
http://www.p38forum.com/