Modern Mailbox | Mid Century Modern Mailbox - Black/Stainless Steel Our modern mailboxes are handmade in the USA out of heavy-duty 16 gauge stainless steel and finished with a durable, weather resistant powder coating. Looking for the next family heirloom, our modern mailbox is built to last the test of time. Wall mounted for easy installation and featuring a top opening lid for convenience, our Mid-Century inspired mailboxes come in two versions: our standard non-locking modern mailbox or locking modern mailbox for those looking for the perfect combination of design and security.