Old Junkunc Bros. American Lock Co. padlock

[Adrian Weber]

I just got an old Junkunc Bros. padlock which I like very much. I only found a few pictures and one video on a padlock like this. I already started cleaning it and with cleaning I just mean removing old dirt and grease. I will leave them like they are and not polish anything! (Would never do that). This might be one of the first mass produced padlocks with ball bearing locking mechanism or am I'm wrong with that guess?

I would like to know how old this padlock might be, the locking mechanism is very interesting (ball bearings with craters in shackle like on my Anchor Las) seems to be a wafer if I am not wrong. There is also a number stamped in at the top. Does anyone know what it means?

Las thing would be the screw on the opening side of the shackle, any idea what this might be for? Can you maybe disassemble the padlock? I do not want to break anything therefore I am careful on this one.

Thanks for your help!