Rick Harrison, the co-owner of the shop featured in "Pawn Stars," offers up five items that have some hidden value, according to Financially Fit:

Zippo lighters
Those refillable metal lighters often got ditched in the 1950s and 1960s. The ones with the highest value were made in 1932.

Baseball cards
Think good condition and originals. Mickey Mantle, Babe Ruth. You get the idea.

Comic books
Condition, age and print number make the difference.

Antique clocks
Working clocks by well-known clockmakers are the most valuable.

Old jewelry
Grandma's old brooch might look ugly, but if it has gold in it, it's worth something.