It's a rather difficult job to tell something only based on photographs.
But let me try it.
This Reichsrevolver is an inspected Saxon officer's revolver. The S. under the serial no. and the remaining inspection markings indicate this fact.
The first picture shows that on the left upper frame side, directly in front of the cylinder, some material has been filed or ground off and treated with cold blue (?). In other words, the proofmark is no longer visible.
The missing Saxon proofmark is a entwined combination of the capital letters A and R, indicating Albert Rex, King of Saxony.
Please look to the rear face of the cylinder and you should find also the regular proofmark, if not it is also ground off.
The loop of the lanyard ring is really machined off. The thin marking is on one side the final inspection stamp (Gothic capital letter with crown) and on the other side the Supervisor inspection stamp, in this case the same as used for the pressure overload test (A and R entwined). Only Saxony used the same marking for the proof as well as for the Supervisor inspection stamp.
The other 3 kingdoms used a particular punch.
The small markings behind the trigger guard are quality inspection markings during the production in the factory. They have directly nothing to do with the official inspection by government inspectors.
More details are pictured and described in my book.