According to Panzer Truppen 2 the Abteilung was formed in early May 1943 with two companies and a total strength of 14 x Pz III and 10 x Pz IV. It became Panzer Abteilung 190 on 6th July 1943 when it was expanded to three companies.
In August 1943 Panzer Abeitlung 190 had one Light and two Medium Companies and reported having 1 x Pz III short 5cm (which I would assume was a command tank), 20 x Pz III 7,5cm and 37 x Pz IV Long.