Here is one of my favorite military single shot: the Comblain from Belgium.
This one is a "trade gun" assembled late in the XIXth early XXth century with parts for use as a cheap military guns either for shooting or the african colonies.

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this one is based on the stock and mechanism of a 1882 Civil Guard model on which a Beaumont barrel has been grafted. Which is very good because the chamber is in 11x53 Beaumont, and that's an immense improvement for a modern shooter on the 11x50 Comblain... 

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Details of the operation closed and opened. The falling block is quite unique in that the entire firing mechanism is contained in the small vertical bit that holds the trigger. A very nice and crisp trigger if you put your finger on the right spot -down), quite heavy if you dont.

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Comblain rifle were made by a variety of makers in both full scale military size or reduced "cadet" or "rook" rifles. To keep track of royalties, each one was marked on the right side of the carcass with a royalty number.

While we are on the subject of Comblains, here are my two. The top one is in 50-70 and the bottom one is in 45-70 courtesy of a Martini-Henry carbine barrel.

GT, it is a fun one to use, and very quick to operate. Jam your thumb in the front bow and the action opens, the case ejects and the hammer cocks. The firing pin is integral with the hammer requiring a slot in the block. That bit that is in the trigger guard with the trigger on it is the lower end of the breech block. It contains the trigger, the v main spring, and the hammer. The block comes a bit forward on closing like a high wall. If you were building one the best improvement would be to remove the recess in the top of the block for the hammer/firing pin and go to a solid block with a firing pin and a reshaped face on the hammer. The Comblain that was made for Brazil was "hammerless", at least the hammer had no spur and was enclosed.

Oneatatime, mine has an S in a diamond. I have not yet tried to identify the maker.
Beautiful Converted Comblain by the way. It's a very fun gun to use.

Yes, Vall, since the trigger spring is also the mainspring you definitely know when you are pulling it. The mainspring is pretty strong also with a very short hammer fall. This link has a pic of the hammer at full cock: (You need to Login or Register to view media files and links) In a custom build the trigger pull might be lowered. Both of mine may have had some trigger work done. I would love to have one of the small action rifles. They're just cute! I also remember seeing a Comblain in Europe that had a bronze receiver. Freebird, this link has pics of a low numbered one like yours with the diamond S. It was also marked Francotte on its original barrel: (You need to Login or Register to view media files and links) This link shows the internals of the various models of the Comblain, large and small. Note how the entire works drop out by just removing the lever pin: (You need to Login or Register to view media files and links) And this one has more detail of the works and should be interesting to someone who wants to tackle building one: (You need to Login or Register to view media files and links) Does anyone have a cartridge headstamped W.R.A. Comblain? These were made by Winchester for Brazil.

Here is a quick shot of three different actions.  The top one is a "Hammerless" Brazilian action.  Actually the hammer is just enclosed in a shroud.  The second one is the Belgian hammer version, and the bottom one is the smaller Rook rifle.   
Bruce

The rook is in 360-2 1/4, which is a common caliber and a great one.  Very similar in size to the 38-55 to look at.   
That is the action that Rodney has plans to copy.   
Bruce