1st Panzer Div had special KStN, on 1st September 1939 it had 1st Panzer Brigade with with two panzer regiments each of two panzer battalions.
Both battalions in 1st Pz Regt had HQ plus two light companies with:
HQ (1 x Pz I, 2 x Pz-II, 1 x Bef-Pz I)
3 x Lt Pltn (2 x Pz I, 3 x Pz II)
1 x Med Pltn (5 x Pz III)
plus a medium company with:
HQ (2 x Pz IV)
1 x Lt Plt (5 x Pz II)
3 x Med Pltn (4 x Pz IV)
The two battalions in 2nd Panzer Regiment were identical apart from slight differences in the makeup of the battalion HQ companies (which had a different KStN).
IRL they probably didn't have enough vehicles to meet the authorised strength, esp Pz IIIs.
The tank company orgs were KStN 1171 (1.03.39) and 1175(Sd) (1.09.39).
Battalion HQs in 1st Pz Regt also had a special KStN, 1107 (Sd) and 1150(Sd) both 1.09.39. 2nd Pz Regt used normal ones.
By May 1940 1st Panzer had adopted the same battalion organisations as 2nd, 5th and 10th Panzer Divs with 2 x Light Co and 1 x Med Co.
Light Co:
HQ (2 x Pz II, 1 x Pz III, 1 x Bef Pz I)
2 x Lt Tk PLtn (2 x Pz I, 3 x Pz II)
2 x Med Tk PLtn (3 x Pz III)
Med Co:
HQ (1 x Pz II, 1 x Pz IV, 1 x Bef BPz I)
1 x Lt Tk Pltn (5 x Pz II)
2 x Med Tk Pltn (4 x Pz IV)
1 x Med Tk Pltn (3 x Pz IV)
Still had four battalions in the panzer brigade.
according to Nafzinger anyway, so YMMV.
