Decent enough pistol. Your analysis is correct. The number under the grip (511) is referred to by long time P38 collectors as the ULG (Under the Left Grip) number. No one knows what it really means, but it has been surmised to have been a number to track the frame through production. The ULG numbers didn't start until early 1943 and presumably by that time they had been in production long enough that perhaps some frames had gone 'missing'.
As you noted, nothing really unusual about it. No big glaring wear or flaws. The E/88 mag goes with an earlier pistol, but it is 'correct' for a Spreewerk. Magazine looks like it has been cleaned up a bit based on the scratches all over it. If you look at the right side of the barrel (the one thing you didn't show a picture of), you will see a letter/number combination, something like 'B7'...that is the lot number of the barrel.
As you noted, nothing really unusual about it. No big glaring wear or flaws. The E/88 mag goes with an earlier pistol, but it is 'correct' for a Spreewerk. Magazine looks like it has been cleaned up a bit based on the scratches all over it. If you look at the right side of the barrel (the one thing you didn't show a picture of), you will see a letter/number combination, something like 'B7'...that is the lot number of the barrel.
