I have no issues with the core frame, core, or paint on this cross.
In fact the loss of paint matches very close to many AWS crosses that I have
seen with this style core (includeing one of my own)
I have not seen this style of pin before. AWS usually used a round wire pin, however
they did use a flat pin on some crosses but not one that looked like this one.
As far as the lock goes, My personal belief is that it was jeweller added.
Either way, it's a nice variation.
Here is one of mine showing the same paint loss to the core-----