The at start number (6/41), 1009, agrees exactly with Niehorster.
http://www.ordersofbattle.darkscape.net ... -06-22.htm
Niehorstor shows another 450 of these early Pz III types not in units. These never appear in WITE. I suspect most of these are the worn out tanks from the Balkans. I'm sure some would be eventually scrapped but most should make it to the East. 210 Pz III Js arrive with 2nd and 5th Panzer. This could be some of those tanks having been repaired and upgraded. I'm not sure if Pz IIIs were diverted to tank crew training.
There is some disagreement on Pz III J production. Some sources, including Wikipedia, only show 1600 Pz III J variants. However, when you add up the variant totals in Wikipedia, you get 4661, more than a thousand fewer than the 5770 generally agreed top line total.
It appears to me WITE Pz III production is 800 light. It is only partially made up by the Panzer IIIs in reinforcements and 450 early model Pz IIIs "vanish". Stated differently, 27% of the Panzer IIIs that existed on 6/41 or were produced thereafter never appear in the East. This number just seems high to me.
In the spreadsheet, Pz III J L42 and L60 production are combined to match the sources and Pz III L&M are combined to match WITE.
