If you often stop in at garage sales or you’ve recently cleaned out your attic, you might find a lot of old items that mean nothing to you but have significant value as collectors items. Things like stamps, coins, sports cards, paintings, and antiques might not look like much, but could be sold for a lot of money—that’s why it’s important to educate yourself on what you should be looking for. Here are 5 valuable collectible items found in attics and garage sales that you should keep an eye out for:

1. Vintage computers
Vintage computers, in particular some of the first models of the Apple computer, can be sold for some big bucks. At an auction, a first edition Apple computer that was hand-numbered by Steve Jobs sold for $440,000, so if you get your hands on one of the vintage pieces made by the Apple founder at a garage sale (or perhaps your dad bought one in 1977 and stuffed it away in the attic), you’re in for a paycheque!

2. Antique musical instruments
Antique musical instruments can bring in a lot of money, especially guitars. Particularly if they’re still in good condition, they can be sold for high amounts if it’s the right model and make. Some of the most valuable include the 1958-1959 Gibson Flying V and the 1936-1942 Martin D-45. Even guitars just 60-70 years old have value, and many people consider vintage guitars to be a form of an investment.

3. Old perfume bottles
That’s right—not the perfume, but the bottles! There are auctions devoted entirely to this item, and they’re so valuable because of the glass, the shape of the bottle, the glass maker could be important, or they may have been a custom-made bottle. So if you find an old perfume bottle at your next garage sale or tucked away in your attic, make sure to do your research before tossing it.

4. First edition books
If you’ve had books passed down to you or you are clearing out your grandparents bookshelves, be sure to do a careful inspection before throwing them in the donation box. First edition books are rare finds and have great value to them. From the 30s to the 50s, first editions can get you tens of thousands of dollars.

5. Barbie #1
Barbie #1, and many vintage dolls like it, hold high value in the collectors market. However, the first edition Barbie is the most valuable Barbie of all time. If you find any vintage doll in perfect condition, preferably still in the original box, you may have scored yourself a few hundreds or thousands depending on what it is.

6. Stamps

Finding stamps at garage sales can be an exciting treasure hunt for collectors and enthusiasts. These informal sales often unearth hidden gems, as many sellers are unaware of the potential value of the stamps they possess. Enthusiasts who visit garage sales armed with knowledge about stamp rarity, condition, and history have the advantage, as they can identify valuable pieces amidst more common fare. Whether it’s a rare misprint, a vintage stamp from a bygone era, or a complete set that’s been tucked away in an old album, the thrill of discovering these miniature pieces of history adds a special allure to the hobby of stamp collecting.