He Neil,
I took me some time to find some picture's to explane things
Finally found some picture's of the Aberdeen guns on the SVSM site and Flickr
There are 3 main point to identify the 3 various German type of WW2 FlaK, and there are FlaK 18 / FlaK 36 / FlaK 37
First the FlaK 18
The FlaK 18 consists of the Lafettenkreuz 18 (Crossection platform 18) which carries the gun with the cradle
An quick check to recognize this Lafettenkreuz 18 are the round support plates on the outrigger legs, see picture
svsm.org/gallery/88mm-...n/IMG_3588
There are other points to keep them apart, however that will be to complicated to list them
This type of Lafettenkreuz 18 could only be transported with the SonderAanhanger 201 (Sd Ah 201), also shown in the picture
At the rear is the carrige with the double tires on each side, at the front the carriage has an single tire on each side
The front is part where the draw bar for the tractor is fitted, on the Sd Ah 201 the draw bar could not be changed to the other carriage
So all these features make the FlaK in the folder FMAR25 FlaK 36 an FlaK 18
The FlaK 36, was mounted on the Lafettenkreuz 36
An quick check to recognize this Lafettenkreuz 36 are the square support plates on the outrigger legs, see picture
svsm.org/gallery/88mm-...1/IMG_4511
This type of Lafettenkreuz 36 could only be transported with the SonderAanhanger 202 (Sd Ah 202), also shown in the picture
Both carriage's have the double tires on each side
Also there is no real front or rear carriage, because the carriage's are interchangeable with each other
This Lafettenkreuz 36 was used both on the FlaK 36 and FlaK 37
Well, to make it complicated the gun in your picture is not an FlaK 36, actualy it is an FlaK 37
The main difference between the FlaK 36 and the 37 is the "target predictor"
On the FlaK 36 is should look like this (picture is of an FlaK 36 at the Imperial war museum London)
farm4.static.flickr.co...80ce8e.jpg
The same system was also used on the FlaK 18
On the FlaK 37 it looks like, this
svsm.org/gallery/88mm-...1/IMG_4524
This is what the gun at Aberdeen has
Michel