Your 1913 Luger was made without a hold open to retain the toggle train in the open position when the last shot was fired. It was later modified to have a hold open as indicated by the small pin in the frame just above and behind the trigger. There is a crown/letter stamp just below the pin put there to show that the modification was done. When the hold open became a standard factory feature, the pin was no longer visible on the outside.
The 1913 early production guns - like yours - were without a stock lug but part way through production the lug was added as a standard feature. The quality of the 1913 Lugers was top drawer.
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