Thanks for the interesting information arb.

Interesting. During his education at the military medical academy, he was assigned for 2 years at the children's hospitel of the Charite in Berlin. Normaly children aren't soldiers.

Some results of a quick google books research:

Felix Hopfengärtner

Geb. am 3. Dezember 1866 in Murrhardt (Württemberg) als Sohn des Oberförsters Hermann Hopfengärtner, gehörte der K.W.-A. an vom 22.10.1884 bis 15.2.1889, wurde promoviert am 28.7.1888, zum Ass.-Arzt befördert am 12.9.1890, verheiratete sich am 20.2.1906. Er war bei der K.W.-A. tätig vom 14.9.1898 bis .30.9.1902, erhielt Kommando an der Universitäts-Kinderklinik der Charite in Berlin in der Zeit vom 24.8.1900 bis 30.9.1902. Er ist zur Zeit [1910] Oberstabsarzt beim K. Württ. Kriegsministerium in Stuttgart. 

Stammliste der Kaiser Wilhelms-Akademie für das Militärärztliche Bildungswesen (1.1.1910)  

Königlich Württembergisches Sanitätskorps.
Den 7. August 1904
Es erhalten ein Patent ihres Dienstgrades vom 17. Mai 1904:
Dr. Hopfengärtner, Stabsarzt und Bats.-Arzt im Gren.-Regt. Königin Olga Nr. 119 (1. Württembergisches)

Deutsche militärärztliche Zeitschrift 1904, p. 86

PS: I lost the fight with the online editor.

Interesting, his father Carl Treite was an officer of the Salvation Armee.

It's a stupid fake. Can you imagine a document, which have signed these 8 people?

Here is the signature of Alfred Rosenberg:

source: https://de.wikipedia.org/wiki/Alfred_Rosenberg#/media/File:Alfred_Rosenberg_-_Signatur.jpg

This is a Prussian Marschallstab from 1895:

source: https://de.wiktionary.org/wiki/Marschallstab

And here is Leopold von Bayern with a Bavarian Stab (1908):

I just found an Austrian one:  Marshal's baton of Archduke Friedrich, Duke of Teschen.

source:  Heeresgeschichtliches Museum Wien

Oops, soory! The problem is that normally you didn’t find names on a CDV. The CDV of Tolstoy was in a small album, which I bought on ebay. On the CDV of Kreuz I bit a few month ago but my purse was too small. 

Do you know the Russian blog of HUMUS? He published nice pictures of old Russia. For example he has another photo of Hilarion Tolstoy.

http://humus.livejournal.com/4388402.html

I bought this photo (carte de visite) on Ebay. I don't recognize the uniform and the medals.

He isn’t a soldier. Is he an ambassador or diplomatic staff? Or is he a state official? Which medals is he wearing?

Thank you very much for identifying the medals and also for dating the photo. I didn’t expect to get as much information.

I still have a younger photo, which shows him at the end of his career (with an impressive mustache).
 

I have a picture of Hilarion Tolstoy (1832-1904), lieutenant-general of artillery (at the end of his career).

Can anyone identify the medals?

Many thanks in advance

Wilhelm did not need the rank of a colonel general. He was the Kaiser.

He was never promoted German Field Marshal or Germann Grand Admiral. Who should appoint him?  He just put on the uniform. 

On May 4, 1900 awarded the Austrian emperor Franz Josef Wilhelm II. the title (not a military rang) of an Austrian Field Marshal. 

Before Wilhelm II became the German emperor, he had a normal for its position as crown prince military career:

1869, January 27 Leutnant

1876, March 22 Oberleutnant

1880, March 22 Hauptmann

1885, September 16 Oberst

At Least Wilhelm II was promoted on January 27 in 1888 Major General, comanding the 2^nd Garde Infantry Brigade.

Titles and Rangs of Wilhelm II.

Heino Fricke was not a photographer but he was a publisher. I asked myself, how he got the photos. I found the following note on the Internet.

Bernhard Otto Frick (later he called himself Fricke), German photographer. Born on April 3, 1857 
in Chemnitz, the son of Ratsexpedient August Leberecht Frick. On April 2, 1883, he appeared as amaster photographer in the photo studio L. Haase & Co. in Berlin as a photographic staff. Haase was one of the oldest and most prominent photo studios in Berlin. In 1886 he took over the studio 
of Leopold Haase. He was married to photographer Emilie Petersen, born in 1859 in Schleswig. 
Together they opened in May 1890, a photo studio in Frankfurt/a.d. Oder. Until 1897, they continued both studios. Then they gave up their activities in Berlin. 

Probably Heinro Fricke is related to Bernhard Otto Fricke. May be they were brothers.   

Thank you for your response Bernhard. The reason for the mourning band could be the death of Friedrich Wilhelm IV. in 1861. The grand duke of Baden was very close to the Hohenzollern family. He was the son in law of Wilhelm I. king of Prussia and later the German emperor.

This photo is taken in the 1860s at Haase & Comp. in Berlin. It shows Friedrich I. Grand Duke of Baden. He is wearing a black armband (Armbinde). Why? 
I know that the Prussian and Austrian soldiers wore an armband in the German-Danish War, to mutually recognize each other - only this was white.