BOSTON ( TheStreet) -- National Presto Industries ( NPK) has been transformed from an ugly duckling into a stock-market swan. The maker of small cooking appliances, a longtime "Under the Radar" favorite, is now being courted by individual and institutional investors.TheStreet.com recommended National Presto on July 9 and again Dec. 9. It delivered 68% and 36% gains since those articles, besting the Russell 2000, a small-cap barometer. The investment criteria: a deceptively large yield (due to special annual dividends unaccounted for in stock screeners), impressive growth rates and a peer-relative discount. Investors flooded into the appliance manufacturer this winter as the economy recovered. Despite the recession, Presto has increased revenue 22% annually, on average, since 2007 and boosted profit 36% a year. Sadly, the undiscovered appeal of the stock has dissipated. It recorded a 52-week high of $128.15 on March 9. National Presto still boasts a pristine balance sheet, with $132 million of cash and no debt. Its third-quarter gross margin extended from 19% to 27% and its operating margin widened from 13% to 21%. The company just inked a five-year contract with the United States Army to supply 40-millimeter tactical and practice ammunition. To boot, Chief Executive Officer Maryjo Cohen quoted Lord of the Rings author J.R.R. Tolkien in her fourth-quarter commentary. In reference to margin benefits stemming from reduced commodity costs, and indirectly a weak economy, she noted "it's an ill wind as blows nobody no good." For those in the know, Tolkien references are a critical bullish signal. Presto's annual dividend is an anomalous reward. In January 2009, amid stock market chaos, the board paid out a special $4.55 on top of its regular $1 dividend, yielding to 10.5% of the stock price on payment date. Continuing its tradition of surprise payouts, it's distributing a $1 regular and a $7.15 special dividend to shareholders of record on March 4. That translates to a 7% yield on the announcement date. Traders are now piling into the stock and the market value is approaching $1 billion, a threshold that will likely attract a few Johnny-come-lately sell-side analysts. It's wonderful to see the little toaster-maker-that-could from Eau Claire, Wisconsin, making it to the big-time.