Kees, thanks a lot for the additional picture.
It seems many of the photographers that time moved the aircrafts to get the best contrast on their b/w photos, using the light and the scenery around.
And to the abreviations – for a correct writing you can always count on me.
(What not means I’m doing everything right, but I’m trying

)
I could write a long article but I don’t want to.
For short: This time there were no rules that are today; you write with dots if you want the whole words to be read and without if the abreviation should be to read.
I don’t think you loose historical corectness if you use the common forms of abreviations without dots if you not quote from contemporary sources that use this form.
Otherwise it depends on what you prefer as there are different forms around for all the companies AEG, BFW, LFG, MLG, NFW and so on. Same for “GmbH” or “AG”.
I’m going to keep one style.
Cheers
Aquilius