The barrel lienght change with the J modell..... (5cm gun)
I have this pic in a book....(el alamein) from the pic it looks like either a J or L
H had smoke candels on the rear plate..... (this tank dose not)
M had wading equipment on the rear plate (this tank dose not)
from the angle of the pic we cannot tell the leinght of the barrel..... If you look at the side of of the turret you will not see a vision port in front of the open hatch on the turret side... all of the MIII's had these up till the L went into production. (L production ran from June42 to December.... El Alamein occured in October) based on all of this data, I would guess that this was a MIIIL.... (or Late J it was common to see changes occur while a tank was in production.... ie deletion of vision ports)
Herr Gray