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It looks like Rothe to me but their orders were marked with FR.

Second Serbian Uprising Commemorative Medal (Војна споменица поводом 200 година Другог српског устанка).
Separate topic about it can be found here.

Silver Medal for Zealous Service (Сребрна медаља за ревносну службу).
Incorrect ribbon, photos found here.

Silver Medal for Merits (Сребрна медаља за заслуге).
Photos found here.

Silver Medal for Bravery "Miloš Obilić" (Сребрна медаља за храброст „Милош Обилић“).
Photos found here.

I think they are awarding only documents, otherwise we would probably have the opportunity to see the orders on website of Hereditary Prince of Montenegro, Serbia and Albania. 
Awarding ceremonies, images found on HRH Prince Predrag Jakovljevic De Obrenovic of Serbia FB page.

Medal for Zealous Military Service - 10 Years (Војна спомен-медаља за ревносну војну службу за 10 година).
Photos found here.

Perhaps he could then reintroduce old Obrenović dynasty decorations, oops, someone already did that 
Takovo and Miloš awarded to His Imperial and Royal Highness Stephan Tchernetich, Hereditary Prince of Montenegro, Serbia and Albania, photos found here.
Obrenović Royal House webiste: http://www.royalhouseofobrenovic.org/en/

Medal for Zealous Military Service - 20 Years (Војна спомен-медаља за ревносну војну службу за 20 година).
I'm not sure where from are these pics, ebay maybe.

Medal for Zealous Military Service - 10 Years (Војна спомен-медаља за ревносну војну службу за 10 година).
Photos found here.

Greetings Georg and thank you for expressing your opinion.
When I got this order it was in terrible shape, apart from the damage you can see it looked like as if it was submerged in some kind of oil. That wasn't patina but some black stuff which I barely cleaned. I never clean decorations but this one was in so bad state that I had to do something. You can still see traces of that black thing on couple of places, especially on the screw nut. 
Perhaps that's the reason why the gilt looks strange.
I made couple of photos, I hope this one can show that the silver plate is lost. That doesn't look like a trace of golden color or anything left over after gilding, silver plate layer is on top.
Unfortunately I'm not able to test the order, but I would be very surprised if it turned out to be silver, I think that's not very likely.

I think that you are right! The painting is work of Stevan Todorović and it was made in 1881.
My guess about the date was based on his decorations.
A year or two ago I read some newspaper article about a book in which the author claims that Milan was father of Winston Churchill. Apparently Milan was lover of Churchill's mother and aunt. How much of this is true I don't know, just thought it might be interesting to mention.

Commemorative Medal for Participation in the Military Parade "Belgrade 2014" (Војна споменица за учешће на војној паради "Београд 2014.")
Photos found here.

I stumbled upon this remarkable photo on ebay.

 

His right side:
1) Montenegrin Order of Danilo
2) French Legion of Honor 
3) Italian Order of Saints Maurice and Lazarus
4) Romanian Star

Around the neck: Russian Order of St. George 

His left side:
1) Austro-Hungarian Order of St. Stephen
2) Order of Takovo
3) Russian Order of St. Andrew?
4) Ottoman Order of Osmanieh 
5) Austro-Hungarian Order of Leopold
6) ???

Medals:
7) Wars for Liberation and Independence Commemorative Medal
8) Romanian Medal of Military Virtue
9) Romanian Defenders of Independence Medal 1877-78

Photo was made in Novi Sad, part of Austria-Hungary back then. Based on that I think he's most likely wearing sash of the Order of St. Stephen. My guess is that the photo was made in the early 1880s.

You are welcome! That's just my opinion.
I have the same type of 2nd class order with a smaller number. One thing has been puzzling me ever since I go it. Silverplate has been lost on some parts and you can clearly see yellowish metal underneath. At the same time central part has been damaged and the metal underneath has silver color! How is this possible? 

Greetings Georg,

Take a look at type 1C above. The seller claimed he tested it with acid and it came positive. I kind of suspected it's really silver and bought it anyway because I didn't have that variant. When it arrived I noticed he really tested it but once I got it in my hands I could see there's no way it's really silver. So what's the deal, I think these orders are silverplated and people are not doing the acid test the way it should be done.

Here's a nice explanation I found online: "If you attempt to test your items yourself, make sure you take a sample from well below the silverplate. Silverplate will show a positive test for silver if you apply acid directly on to it. You must make a deep groove in the piece so you are below the plating before you can apply your acid. This is the most accurate way to test silver by yourself, as this is the method most jewelers use." 
 

You are most welcome, Markus. I'm glad if my replies were helpful. 
Some of the Rothe's and Scheid's depictions of St. Sava are the most beautiful ones to me.
Whether 1st type or not one thing is certain, absolutely amazing order and a great catch!
Once again my congrats, I hope you'll have the star in your hands soon!

Quickly made comparison, there are differences but they are pretty similar.

 

You are most welcome, Markus. 
Unfortunately I think there was overlapping, which, when you think about it, is not illogical. Why would they make a different depiction of the saint Sava when only the royal cipher was replaced with the year of institution. I'm not trying to say that your order is not 1st type, it's just that I can't say for sure.
For example take a look at this one.

Source: http://libraryblogs.is.ed.ac.uk/untoldstories/tag/order-of-st-sava/

It was awarded in in June 1915 to Colonel Sir William Hunter so it must be 2nd type. 

Thanks! I do my best to post every piece of information and photo I find online regarding new Serbian decorations. 

If someone did that on purpose in order to make a "special variant" then he or she is an idiot.
It seems more likely, at least to me, that someone decided to pretty it up after losing part of the order with motto surrounding St. Sava. 

I'm pleased to hear it found a good new home, my congrats on such a great addition to your collection!
Thanks for the link, I somehow missed it. 
Difference between 1st and 2nd class star is their size. If I remember well 1st class star should be 90mm and 2nd class 84mm, at least in theory, actual size can vary a little bit. There's a small "trick" how to quickly tell which class is the star. Badge on the first class star should be the same size as 1st/2nd/3rd class badge, and badge on the 2nd class star should be the same size as 4th/5th class order.
As to your other question, I don't know any other way for telling them apart, but in some cases that is not very reliable method. I've seen stars from 1st type sets with depiction of St. Sava looking exactly the same as on some 2 type stars in terms of details and quality.

I see that one more interesting piece found its way to emedals. I presume the central metal piece with inscription and Danilo's cipher fell off and someone replaced it. The cipher that we can see is unusually large and lacks the princely crown, that is something I've never seen on Mayer's piece.
http://www.emedals.com/a-montenegrin-order-of-danilo-second-class-breast-star-by-vinc-mayer-wien

Link to Bene Merenti auction: http://www.benemerenti.de/php/us_vorschau.php?lnr=4&wnr=ABB
LotNo.: 0121 "Very curios issue, where the medaillon shows only the cipher, without the crown and its surrounding motto."

One more interesting Sorlini's St. Sava got sold on Bene Merenti recently. 

Now you can see it on emedals: http://www.emedals.com/a-serbian-order-of-st-sava-grand-cross-breast-star-1915-1941

Link to BM auction: http://www.benemerenti.de/php/us_vorschau.php?lnr=4&wnr=ABB
LotNo.: 0939 "The medallion wreath in variant issue" whatever that means.

Who knows, I don't know where are they coming from but most of the guys thought some ex-Yu country.