These next two photographs are of the markings that are found on the left side of this Steyr model 1909 pistol. In the photograph on the left, the pistol is stamped on the left side of the barrel assembly as follows, "PAT. No 9379-05 u. No. 25025-06." This inscription indicates that the pistol is made from these two patent numbers that are dated 1905 and 1906. The last two numbers following the patent number is the date. The abbreviated "PAT." indicates "patent", the abbreviated "No" indicates "number" and the abbreviated letter "u" indicates the word "und" which is translated from German to English to mean "and". Underneath the patent information is the number "14." which indicates the year of manufacture for the pistol as 1914.
At the center of the right edge in the left photograph is what looks like a fingerprint. This is rather what is called the third proof stamp and consists of a two headed eagle with the number of the proof house shown on the breast plate. The number on the breast plate in the above mark is the number four which indicates the Vienna proof house.
The proof law of June 23, 1891 made proof compulsory for all barrels manufactured in Austria-Hungary. This law required three different proof steps for shotgun barrels. The unfinished barrels underwent the first proof, the joined barrels of double barreled shotguns, combination guns, and drillings underwent the second proofing, while finished shotguns and handguns had to undergo the third proof.
Each of the proofs consisted of a stiffer load than used in the preceding shot. The propellant was a fine grained Austrian black power(Jagd-und Scheibenpulver Nr.1). For the first two proofs a lead cylinder was used as a projectile, while the third proof load called for the use of a prescribed amount of lead shot. The first proof load was designed to produce twice the normal chamber pressure as created by a standard load; the second proof then increased the pressure by 2/3 over that of a standard load, and the third proof increased the pressure by another 1/3. During the first and second proof firing, the open rear of the barrel was closed by means of a temporary bolt, but for the third proof firing, the firearm had to be completed and ready to use. Handguns will only by stamped with the third proof mark after successfully passing the proof tests. A side by side shotgun or combination gun will show all three proof marks while a single barreled shotgun will only have the first and third proof mark after passing the proof tests.
The slide legend in the picture on the right reads as follows, "OESTERR. WAFFENFABRIKS-GES." and then underneath that is "STEYR." This inscription indicates "Österreichische Waffenfabriksgesellschaft" or "Austrian Weapons Manufacturing Incorporated".
The lever at the rear in the picture on the right is the thumb safety which is shown in the fire position.