Pre-war training unit codes

[obdl3945]

Hello...

Any chance someone may be able to help me out with this query?

According to Alain Fleuret's Luftwaffe Camouflage 1935-40 (Kookabura), p76, he states that on 1 June 1936, as part of the general recoding of all Luftwaffe machines, training units were henceforth coded with an 'S' (Schule) as their new code prefix, the example given being S7+B96. This stood for aircraft 96 within the Schule, Flight 'B' (2nd Flight) of the training school, within Luftkreis 7, HQ at Braunschweig. He continues by indicating that within the same given school, both the old number system and the new letter/number combination could be seen in use.

Given the above interpretation of S7+B96, I am a little confused about two pictures I have seen, one of a Ju52 coded S17+B01 and the other a He111B coded S13+D23. Although I understand the mechanics of the above 'S7' code, these other two codes do not fit the rule, as there was not a 13th or 17th Luftkreis.

So, my question is: are these two codes examples of a hybrid style, perhaps? Could S17+B01 actually mean aircraft '1' of Flight 'B', within the seventh unit (in this case a Schule) of Luftkreis 1, HQ at Königsberg, with the code being prefixed with 'S' to indicate its training status? Similarly, therefore, S13+D23 could perhaps mean aircraft 23, Flight 'D' of the third unit within Luftkreis 1.

I admit I'm guessing, but it is an intruiging puzzle. Any thoughts...?

Regards...