Heinmot,
The tape is a "crush" indicator. As Unspellable stated, when you fire the Luger with a given load, if the toggle extension dents the tape but doesn't cut it, the spring and load are just about perfect. If there is no mark on the tape, the spring is too strong for the load and you are not getting a full toggle motion in recoil. If the tape is cut/strongly crushed, the spring is too light for the load and the toggle is cycling too violently.
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If it's made after 1918...it's a reproduction
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