Ferdinand #501. This vehicle was delivered to the NIBT proving grounds in September of 1943. It lost a track to a mine. This was repaired and the vehicle used for testing. This vehicle is now in the Kubinka Museum.
#501 was the vehicle of Oberleutnant Hans-Joachim Wilde, the commander of the 1st battery (5./654) of the 654th Heavy Tank Destroyer battalion.
The Red Army GBTU had no idea that the Germans had produced the Ferdinand, it went from production to action relatively quickly.The Western Allies also knew nothing of the Ferdinand.
The study of the new German vehicle began on July 15th, during the battle of Kursk. A group of officers from the NIBT proving grounds consisting of Engineer-Colonel Kalidov, Senior Technician-Lieutenant Kzhak, and Technician-Lieutenant Serov arrived at the Central Front. By that point, the fighting at Ponyri and the 1st of May farm had ended. In addition to inspection of the knocked-out vehicles, the specialists questioned German prisoners. Soviet soldiers and officers that took part in the fighting also shared some information. Finally, the Soviet specialists got their hands-on German instructions on the Ferdinand. The study of the actual vehicle began on July 15th, while the battle was still going on.
The first group of specialists from the NIBT proving grounds left the battlefield on August 4th. On August 24th, a second group arrived, consisting of Engineer-Major Hinskiy, Senior Technician-Lieutenant Ilyin, and Lieutenant Burlakov. The task of this group was to collect the most valuable German vehicles on the Central Front until September 8th, and then deliver them to the NIBT proving grounds. Three vehicles were recovered. Aside from the #501, an SPG #624 with serial number 15090 was taken. It was also knocked out by a mine. #501 and #624 were used for study and trials, #502 was shot up with domestic and foreign weapons