When it comes to cards produced in the 1980's, the four Cal Ripken Jr. rookie cards easily stand out as some of the most desirable.

And you may be surprised at just how valuable they can be...

Most cards produced in the 1980's aren't worth much at all because of overproduction.

But in top condition, Cal Ripken Jr.'s rookie cards can be worth several hundred dollars.

Ripken left a legacy as the most durable player of all-time with incredible hitting power for a shortstop.

He was simply one of the best shortstops to ever play the game...

And this guide I go over everything you need to know about collecting his rookie cards.

Let's get started!

The 1970 Topps O.J. Simpson rookie card is one of the most recognizable vintage football cards in the hobby.

Probably best known for being charged with murder in 1994 and convicted of armed robbery and kidnapping in 2008, Simpson was famous long before that for his football skills.

"In fact, "The Juice", was undeniably one of the greatest running backs to ever set foot on the gridiron...

And because of his fame, his rookie card still holds considerable value and importance in the football card hobby.

And in this guide, I go over the key things you should know before you buy or sell one.

Let's jump right in!

The demand for key Michael Jordan cards has long been sky high in this hobby...

And the market for them doesn't seem to be slowing anytime soon.

After all, he's nearly unanimously regarded as the greatest basketball player of all-time so his popularity is still at astronomical levels.

But just how valuable are some of his cards? 

In this guide, we will cover his 23 most valuable cards ever sold and will discuss what makes each of them so special.

Let's jump right in...