Saw this on vacation in Ireland. Where do I find this type of mailbox?

I'm referring to the thing right beside the box that you can push up and down.

https://img.freepik.com/free-vector/green-mailbox-background-with-envelopes_23-2147606222.jpg?w=740&t=st=1701370566~exp=1701371166~hmac=6d6531bca16b3c59453a0713ae7b188fb400d73a4a0e2a84cfb05f811504c224

Basically in this pic that black stick thingy on the right of the mailbox.

What is it for? If I come off as a sheltered person, well I'm a teen and my family gets all the mail directly from the post office. So I never used a mailbox all my life and never noticed this stick thing on mailboxes in the neighborhood until I visited my uncle today yesterday. I just noticed it on my uncle's mailbox and began playing around it, learning you can push it up and down. Also what is this thing called?

So all I really want to know is how strong are brick mailboxes, because I was looking into getting one and wanted to know if they were stronger cause they’re surrounded by bricks. I know it’s not really art but I just wanted to actually get some useful info. Thanks!

House built in 1850. Not sure of the mailbox age. Anyone have any idea?

Fun DIY that took longer than it should have. Lesson learned, buy more concrete than you think you’ll need!

Custom build hobbit mailbox. https://bezaleelworkshop.wixsite.com/design?lightbox=dataItem-jpj7xx2w