GG-W-113

[flieger]

Hi all,
I got this from the bay, and finally bought a black NATO for it. I´m almost sure that the case is original, and almost sure that the seconds hand isn't. I´m no expert, just love the looks and history behind these watches. I know I should have asked before pulling the trigger but could´t resist (according to the marks is from my birth year). Anything you can teach me about it will be helpful.
Thanks,

[flieger]

I found this picture of another gg-w-113 and the numbers in the back match with mine so I´m pretty sure that the case is Hamilton original.



I don´t know how to reach the movement, so I´ll leave that part to the watchmaker.
Any idea about where could I find original parts?