Thanks Ron!! That makes lots of sense. I believe that pin is a dead pin, unremovable. Its functionality is unknown to me yet. It's hard to guess from outside view, I need to disassemble this gun...... read postie's method, but I have not tried yet because I have one concern -- if it still unopenable, then water from air could condense inside.
It's interesting to note Astra Large Ring Hammer does not block rear sight notch at it's down position. Mauser's Large Ring and Fix Sight Conehammer do block aiming when hammer is down, and Mauser applied higher rear sight on Fix Sight Small Ring, the intention was probably to solve that problem. Astra was a very late gun, it does not have this problem from the beginning.
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