What is the value of a Walther P38 made in the 1940s?

Without actually having the pistol in his hands, a licensed gunsmith or weapons expert will never be able to say. As with all things of value, it depends. It depends on:

• Condition
• Serial Number
• Function
• Number of guns produced, and still in existence.
• Attainability or similar weapons.
• Alterations to the original
• Even previous owners can affect the value of a gun. If for instance the weapon were owned by Erwin Rommel, it could be priceless. If however it was previously owned by Hanz Romal (some unknown infantryman from the Wehrmacht) the value will not be increased.

If you have a gun that has been pieced together, it will be worth less. If it is damaged, it will be worth less. If you cleaned the acquired patina from the weapon, you will reduce its value. If the gun is one of 4 million made, and 3.9 million of them still exist, it will not be worth much.

These and many other factors must be considered in the valuation of a firearm. Seek professional advice--in person.