The headline for this press photo, affixed to the back of the photograph on a piece of paper, reads “The 'Stingers' of a Mighty Wasp” with instructions to use the photograph in connection with articles on the European crisis. As the date was unfortunately faded away, it is difficult to assess when the photograph was taken. However, the instructions suggest a date during the Drôle de Guerre, or Phoney War, which ran from September 3, 1939 to May 10, 1940. As for the aircraft, the most likely candidate is the Potez 390 A2 (Artillerie Biplace) observation aircraft and since the print on the photograph lists Paris as the location, this suggests it belonged to one of seven Escadron d'Observation units that was equipped with the type and operating near the "La Ville-Lumière" ("City of Light" as Paris is known). The Potez 390 was, by 1940, woefully obsolete yet the situation of the looming war kept them in service past their prime. They were retired from frontline service only in October 1939 but continued to serve as training aircraft until the defeat of France in June 1940.
The Potez 390 started out as the Potez 39 and design work had commenced in 1928 with the first flight occurring in January 1930. It was to replace the aging Breguet 19 and Potez 25 aircraft then in service. It was a two-seat, parasol monoplane that was of all-metal construction, a first for Potez. Power came from a single Hispano-Suiza 12H 12-cylinder, air-cooled V-engine that developed 580 horsepower that drove a 2-blade, fixed pitch propeller. This provided the aircraft with a maximum speed of 155mph at 11,483 feet. Enough fuel was carried to give the aircraft an operational range of 500 miles. The maximum service ceiling was 23,000 feet and to attain its maximum speed altitude, it took the Potez 39 a total of nine minutes to achieve it. The Potez 39 was a fairly large plane, having a span of 52.6 feet, a length of 32.1 feet, and a height of 11.2 feet. The total wing area was 377 square feet and the combat weight of the aircraft was 5,842 pounds. The aircraft was accepted by the Armée de l'Air and put into production as the Potez 390 with the first deliveries starting in 1934.
For weapons, the armament consisted of dual Darne-built Lewis Model 1915 machine-guns chambered for the standard British 7.7mm (.303 inch) cartridge and this is what we see in the photograph. The entire mount was of the Tourelles (Turret) TO 10 type. This is the rear firing gun position (manned by the observer) and movement of the guns was entirely manual. The round pan magazines (that held 47 or 97 rounds) that sat atop the weapons are not fitted here. Just behind the gun mount are canvas bags to catch the ejected brass so as not to pose a slipping hazard for the firer. Fitted into the nose of the Potez 390 was a single 7.5mm Darne machine-gun. If need be, a modest bomb load totaling 265 pounds could be carried on under-fuselage racks.
By 1939, all seven units equipped with the Potez 390 were grouped under the 1st. Armée Aérienne and consisted of Groupe Aérien d'Observation (GAO) 504 (based at Chartres), GAO 511 (Nantes), GAO 510 (Rennes Saint-Jacques), GAO 505 (Epernay-Plivot), GAO 517 (Nancy-Essey), GAO 512 (Limoges), and GAO 513 (Montbéliard). Given the photograph mentions Paris, the two units nearest the city were GAO 504 and GAO 505 but without being able to see any insignia on the aircraft, we cannot say with any certainty what unit the Potez 390 belonged to. When the Germans invaded France on May 10, 1940, there were a total of 43 Potez 390 aircraft within France. Of this total, 29 were distributed amongst the active units with a total of 20 operational planes. Another 11 aircraft were assigned to training schools with 5 of them operational, while the remaining 3 aircraft had been retained for experimental purposes with all 3 in non-operational condition. By this time, the more modern Potez 63.11 twin-engine aircraft was the main equipment for French observation squadrons. No unit is known to have flown the Potez 390 in combat against the Germans.
The only other user of the Potez 39 was the Peruvian Air Force that bought twelve Potez 391 aircraft. This was simply the Potez 390 but fitted with a Lorraine 12Hdr Pétrel supercharged, 12-cylinder, water-cooled V-engine that developed 500 horsepower at 2,300rpm. It also had a larger air intake than the Potez 390.
