A photo on page 62 of Jentz's; Panther Tank, the Quest for Combat Supremacy , shows an Ausf A without Zimmerit. This vehicle was built by Daimler-Benz on or about October 1st, 1943, a month after Ausf A production began, Zimmerit application was to have started in Sept. The Fahrgestell nummer or Chassis Number of this vehicle is 151951. Fgst.Nr. for Panther Ausf A built at Daimler-Benz ran between 151901 through 152575. This means there were 50 Panther Ausf As built at D-B by Oct.1st, when this vehicle, which was without Zimmerit, rolled off the assembly line. Zimmerit application did not start at D-B until November, thus the subsequent October production vehicles did not have it either. A similar delay situation could also have existed at MAN, MNH and Demag as well, I don't know without further research.