DKW F Pre-war models Distinguishing features based on images?

Hello dear ones, I have found some pictures of my grandfather from World War II, on which he is traveling with a DKW of the F row. Unfortunately I do not look through the individual models and classes in which they differ in detail. Maybe there is someone who can help me with the jumps. What I can say is that it was a Wehrmacht vehicle, Winker has a steeper radiator grill than many others, the windscreen wiper is attached at the top u and a Notek camouflage headlight was installed, which is certainly not useful for identification. Thank you in advance and I hope uploading the pictures worked. LG from ratings