If you've ever come across an old postcard tucked away in a drawer or attic, you might be sitting on a surprising treasure.

Antique Christmas postcards are an affordable collectible favored by many collectors. The practice of collecting postcards of all types is called "deltiology," and those who collect consider the years ...

Many postcards sold for a few cents (or even a penny) when they were first made, but they’re a lot more valuable now. The value of old postcards depends several factors, including their condition, ...