Serial number 28070 located on underside of barrel and butt of frame. Its not a beauty, just a survivor... the trigger is broken at the top portion of the assembly where it contacts the hammer. No main spring or trigger return spring and was fitted with square butt grips on the round butt frame.
In many of the discussions I have followed, the topic talked about most was the identification of 1902 and 1905 by the square butt or round butt design, but internally they are different especially the trigger. The 1902 I have is designed with a flat curved trigger return leaf that attaches midway up the inside of the frame grip area (where your fingers would wrap) and curves to the trigger return assembly just aft of the trigger. The assembly differs from the 1905 in that its a wedged shaped rebound lever with a trigger lever fitted in to it which extends into the trigger. The assembly is mounted via a stud on the frame, where as the 1905 has a rebound slide and rod for the trigger return. The 1902 trigger has a claw on one side that activates the cylinder stop and is round on the other side to allow it to rotate around the cylinder stop.
The attached photo is not my gun... mine's too ugly to display. Note in the photo the main spring and trigger return springs. The trigger return comes into contact with the return trigger lever inside the rebound lever. The 1905 has a rod that extends from the trigger to the rebound slide that contains a spring. Look closely at the trigger photo. You're looking at the trigger straight on (finger side) note the small spring and cam inside the trigger. That cam (on the opposite side of the trigger) touches the trigger return lever which is tensioned by the trigger return spring. (Note the end of my trigger is broken off. This allows you to see the small spring and cam. I did not include a picture of the broken piece.) The 4th and 5th pictures are of the rebound lever and trigger lever.
I've had no luck finding a 1902 trigger and have not as yet taken the broken one to a gunsmith to ask about fixing. I do not believe it can be fixed and the cost would be way too much for the value of the gun. Not trying to make the gun one you could fire, just one that has survived.