This early-20th-century mailbox carries cachet because it was produced by Griswold, one of the most sought-after makers of cast iron. In operation from 1865 until 1957, the company specialized in cookware, but ardent cast-iron collectors are interested in all forms. This No. 3 mailbox from 1910 is no exception. Unpainted examples are valued at $350; because this one bears an unoriginal, though eye-catching, green paint job, its value is considerably less, says Marsha Dixey of Heritage Auctions.
What it’s worth: $125
