Well, what do you want to know about that old big padlock?
It has the old style logo. During the years they changed it a few times. This is the first version and it's on the background of the 2015 catalog cover.
The number engraved on the lock body looks like a security rating.
The company that made it is CISA:
Costruzione Italiana Serrature Affini, that means Italian maker of locks and alike. It was founded in Florence in 1926. This is the company website
http://www.cisa.com/en/header/about_CISA.html If you have specific questions feel free to ask.
Cheers
