From the front, this set is identical to a regular 1990 Topps card. You have to look for the French on the back to tell the difference. The only other difference is that the backs of the OPC cards are a bit brighter than the regular set.

When sorting through your 1982 Topps, be on the lookout for the Blackless cards. These cards typically are missing the facsimile signature along with some other color differences.

Yes, we all know about the factory vs. pack border and the infamous inc(.) on the back. However, instead of looking at all those dots to tell which is which, separate them by the color of the back of the cards, one with the "inc." is a different shade than the one with the "inc". This will help instead of using a magnifying glass on every...single...one.

Can't tell the difference from the Factory Set card from the pack version when the borders on the front are the same? Look at the back of the card at the last line of Career Highlights. That last line of text will end at a different spot in order to tell the difference between Factory and pack versions.

When going through your 1992 Upper Deck cards, check the holograms on the back. If the hologram is gold, then it is from the Factory Set. Hey, I'll take this over crossed hockey sticks any day...

Watch your 1990 Fleer cards! If it says "Ptd. in Canada" at the end of the copyright line on the bottom of the back of the card, then it's from the Canadian set.

From the front, this set is identical to a regular 1991 Topps card. You have to look for the French and the white card stock on the back to tell the difference.

These something to look out for when thumbing through your stack of 1954 Topps and removing those nasty doubles! Be aware that only difference between the standard 1954 Topps set and the Canadian set is that the standard set have white backs, the Canadian set have gray backs.

Seriously, if you're not taking a moment to see the difference of the backs with these iconic cards, you should be collecting houses instead of baseball cards.

When flipping through those cards, we usually don't look at the upper right side. However, "nestled" up in the corner is a Nestle logo. Yes, the logo is different from the regular set, but this might get past some collectors.

Bad news: 1988 Score Promos cards look the same as the regular set except the 1988 stat line and the "Career Totals" stat line are all zeros. They're also numbered the same as the regular set.

Good news is that the only made six cards, and very close to each other in numbering (between 1 and 150): 30, 48, 71, 72, 121 and 145.