StG77 Ju87B-1 code/emblem question

There were couple photos at e-bay of the Ju87B-1, coded S2+A? :





The emblem is attributed to Stab.II/StG77, so the last letter should be "C", and "A", as well as spinners tip, should be green, like on this profile:



but they are obvious white.
If "A" white, then this aircraft should belong to 4./StG77, and the last letter "M", but what's with emblem?
So my questions are:
1) What is the last letter?
2) What colour is "A"?
3) Were wingtips yellow (can't say for sure from this photos)

Sergey.

[Primoz]

It's a B-1, but it has been retrofitted with an armored rear gunner's position. Very interesting indeed.

[Merlin]

Sergey,

please note the white number 25 on the wheel cover. This defines the aircraft as belonging to the Ergänzungsstaffel/StG 77. This Staffel used white spinners and white letters on their aircraft.

The emblem of the former owner, the Stab II./StG 77, was not repainted.