To answer your question, wrote a brief explanation following this photo:
All this has to be done with the hammer in the safety position. To release the top break, I grab the lock plate (the round "checkered" head is on both sides) with thumb and forefinger, and pull up. Comes up about 30* or so on a screw as the end by the hammer releases from the frame assembly. The upward rotation happens right under the rear sight.
When I have the revolver completely opened, the ejector star automatically drops back into the cylinder, and this latch also drops flush to the barrel top. That happens so quickly you can almost miss seeing it. After re-loading ammo, just close it up and the latch locks it back to the frame.
Trust my explanation is clear....this is all new to me, and I'm just learning how to operate this revolver. It's been interesting.
JEBar wrote:that's way beyond very nice .... what opens the top lock