Blank back cards?

I just bought a lot which included a bunch of common 1984 topps cards in order to help complete some sets. I got 4 or so that have no printing at all on the back. How rare/common are these, and do they have any value as mint errors?
MS66 taste on an MS63 budget.
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Comments
Notice how Hubie's cap doesn't cover up the thick black line at the top of the box. If your blank-backed cards are like this, then they're unusual enough to attract a buyer (or two). If they're blank-backed-regular-issue '84 Topps cards, then they're interesting, but not too many people will pay a premium (unless they're popular HOFers).
bobsbbcards SGC Registry Sets
What is the deal with the ones you have pictured?
<< <i>What is the deal with the ones you have pictured? >>
I don't know that the ones I have pictured are any more interesting--they just have the advantage of being cataloged and listed as a set in the price guides. From the Standard Catalog (a must own):
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1984 Topps Proofs - Though still small in terms of actual numbers, the quantity of 1984 Topps proofs from the "A" sheet which have made their way into the hobby is relatively large. More precisely, 66 cards (half a production press sheet) are frequently seen in proof version. Like other true proofs, they are blank-backed but these have a very discernible difference from the issued 1984 Topps cards. On the proofs, the portrait photo at lower-left is completely within the black frame of the box. On issued cards, the cap extends above the box border. On the proofs, portrait photos of Steve Carlton and Gary Matthews are found on each other's cards and Manny Trillo is pictured in an Indians uniform, rather than the Expos livery (?) on which he appears in the regularly issued version. Single proofs in the market have been cut from half-sheets.
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bobsbbcards SGC Registry Sets
Snorto~
<< <i>You know, you throw George Bush back there in the stands behind Lefty and you have yourself a million dollar card. >>
Really......hmmmm.......
bobsbbcards SGC Registry Sets
<< <i>
<< <i>You know, you throw George Bush back there in the stands behind Lefty and you have yourself a million dollar card. >>
Really......hmmmm.......
Send me your Paypal address and I shall remit payment in the amount of $1,000,000.00 post haste, good sir!
Snorto~
Bowman Baseball -1948-1955
Fleer Baseball-1923, 1959-2007
Al
Kevin
Bowman Baseball -1948-1955
Fleer Baseball-1923, 1959-2007
Al
Bowman Baseball -1948-1955
Fleer Baseball-1923, 1959-2007
Al