Pull the trigger and feel the "click" is not normal on this variation (only normal on those pre-1900 ones).
When you pull the trigger, the trigger raises the sear arm and sear arm raises the sear to release the cocked hammer. On this variation, the sear arm does not disconnect from the trigger top until the rocker plunger pushes it away from the the trigger during the barrel recoil. So, if the gun is empty, pull the trigger, no "click". If you hold the trigger, and use the other hand to push the barrel back a few millimeters, you will feel the "click" -- the gun is unlocked and the sear arm is disconnected from the trigger. That's on a normal gun. Then, you release the barrel, and slowly release the trigger, you will feel the trigger re-engaged with sear arm. This is the way I check a gun during gun show without disassembling it.
On this one, I guess either the sear arm is not numbered to the gun (it's a numbered part on this variation), or it's too worn.
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