Hello again Marzio! The Luger you mentioned, with the eagle-over-135 (E/135) marks is fairly rare!
If you could have someone field strip the pistol, the last two digits should appear on the trigger, the rear toggle pin, hold open lever, breechblock and firing pin.
If the Luger is in good condition, and the parts match, run to buy it at that price.
Good Luck!
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