Your 1990 penny without a mint mark (the letter indicating where it was made) is probably worth one cent. Over 6.8 billion 1990 pennies were produced for general circulation at the Philadelphia mint and have no mint mark by design (the "P" mark was used only on the silver nickels minted during World War II). The rare and valuable non-mint-marked coins were minted in San Francisco, and the lack of an "S" is a genuine mint error. However, coins from the San Francisco mint are intended for collectors; they are "proof" coins of extremely high quality using specially prepared blanks and dies, and they are sold by the mint only in packaged sets.

http://www.bowersandmerena.com/images/auction_pics/13010/64o.jpg

http://www.littletoncoin.com/LCC/html/images/ps1990s-wc.jpg

Of the 3 million or so 1990 pennies minted in San Francisco, about 3000 were missing the "S" mint mark, and these are the valuable ones (an almost-perfect specimen sold at auction in 2007 for over $20,000)
Source(s):
http://www.coinfacts.com/small_cents/cents_lincoln_memorial_reverse.html
http://en.wikipedia.org/wiki/Lincoln_cent#Mintage_figures
http://en.wikipedia.org/wiki/Lincoln_cent#Mint_errors_specific_to_Lincoln_c...
http://en.allexperts.com/q/Coin-Collecting-2297/2009/2/Lincoln-cent-1990-S....
http://www.bowersandmerena.com/auctions/lot_detail.aspx?AuctionNo=13050&...


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