Error card?

So, I recently bought a ton of cards (16 boxes of baseball) from a collector who's just giving up the hobby. Tonight I was just going through a random box sorting out the commons from the guys I know. I found a 1981 Fleer Reggie Jackson card. On the front it says "Mr. Baseball Reggie Jackson" and on the back the number is 79. I went to Beckett just to see the worth (even though I'm not selling it's always cool to see the worth). There were 3 cards, but the one with the front that my card has is #650. So, is this an error on the manufacture or Beckett? Could someone help me? I would really like any info on this card. Thanks!
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CARD NO NAME VARIETY 1-2 3-4 5 6 7 7Q 8 8Q 9 9Q 10 TOTAL
79 REGGIE JACKSON BATTING 0 0 0 2 3 0 14 1 20 1 4 45
No variation in the POP report for #650