The photos of the upper slightly rearward is a common condition when one is unfamiliar with Lugers. Since the last photo shows the Luger properly assembled and the upper in the correct position, I suspect that all the other photos show the gun after it was improperly re-assembled. The S-shaped hook on the bottom of the rear toggle has to engage the transfer lever on the mainspring.
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If it's made after 1918...it's a reproduction
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