Help Identifying a Coded Pull

Hello all,
I recently acquired a small lot of fire alarm stuff for my birthday (a few pull stations, plus a bunch of NFPA manuals and other documentation). One of them was an IBM coded pull station that I cannot for the life of me identify.
If anyone can help me identify this pull I would greatly appreciate it!

Here’s an album if you want to go that route:

Otherwise, this is the front.

These are the only manners of identification on this pull:


(Larger versions are available at the album link, but the first plate “Type” says “NY” and Code is 4-2-5).

Inside the box:

Finally, the back:

Again, thank you in advance for the assistance!

Seems like you identified it pretty well to me, but maybe someone else will have more info.

Thanks for the info. I was hoping that it was more complicated than that but apparently it isn’t.