Mona Lisa has a nice smile, but can she match the gleam of the grill of a 1965 Shelby Daytona Coupe CSX2601?

Some art may be priceless, but American classic cars are becoming more valuable in their own right. Last year, that 1965 Shelby sold at auction in Monterey, Calif., for $7.2 million, the highest price ever paid for an American car.

Mecum, a company that has specialized in high performance and collector cars for more than 20 years, will be at Osceola Heritage Park today through Sunday.

This year's event will feature about 1,000 cars on the auction block, said spokesman Shari McCullough-Arfons. By the time the gavel falls for the last time Sunday night, Mecum expects to sell about $25 million worth of classic Mustangs, Camaros, Corvettes and other makes from the greatest years in American auto manufacturing.

“Mecum has been doing auto auctions in Kissimmee since 2005,” she said, but what began as a Corvette restorers show in Old Town has steadily grown to become one of the biggest auctions in the business. The Kissimmee auction is the second largest on the busy Mecum calendar.

This year's show also will be televised via cable on the HD Theatre on Discovery Channel (Bright House HD channel 1341).

“We’ve come a long way from our first auction at Rockford Airport (Illinois) in 1988,” President Dana Mecum said. “We’re really a ma and pa store that grew up and got big. Our goal has always been to give Mecum Auction attendees an amazing experience and unite them with an incredible car they will enjoy.”

The highlight of this year's Kissimmee show is a 1969 Dodge Daytona Racer owned by former NASCAR driver Bobby Allison. Allison will be at the auction Saturday to sign autographs. The car was driven by Allison during testing at Daytona and Talladega in preparation for the upcoming 1970 NASCAR season. The big auction event is scheduled for 2:50 p.m.

The impressive list of cars to be auctioned include everything from a green 1973 AMC Gremlin X automatic to mint Chevrolet Corvettes. There is a complete list of all cars to be auctioned off at www.mecum.com.

Last year's “record-selling car” in Kissimmee was a 1963 Corvette Sting Ray Z06. Originally sponsored by Gulf Oil, it was one of only 14 Corvettes made in 1963 for competition. The auction selling price was $1,050,000. Other top sellers from last year's Kissimmee auction included a 1962 Mercedes-Benz 300 SL Roadster ($525,000); a 1969 Chevrolet Corvette L88 Convertible race car ($305,000); and a 1957 Chevrolet Corvette Convertible 283 HP Fuelie ($250,000).

Anyone can register to bid on a car at the auction. There is no fee. Bidders can register at the auction. A bank letter of guarantee or refundable deposit is required as well as a valid photo identification. Full payment is required at the time of purchase. Terms are online at http://www.mecum.com/buy.cfm.

The auction also will feature many other kinds of autos as well as other collectibles, such as a 1950s Shell gasoline pump, Coca Cola vending machines, a neon Studebaker sign, a neon AMF bowling sign and more.

Admission to the auction is $10. Gates open each day to preview cars at 8 a.m. The auctions start at 1 p.m. today, 10 a.m. Friday and Saturday and 9 a.m. Sunday.

“Even if you don't want to come out and bid on a car, it is still a great show,” McCullough-Arfons said.

Sharing the bill at the Osceola Heritage Park this weekend is the Orlando International Guitar and Music Expo. It starts Friday (dealer day only) and is open to the public Saturday and Sunday.

One of the nation's largest guitar shows, the event features guitar dealers, buyers, traders, collectors and players.

The event features thousands of guitars, hundreds of dealers and new, used and vintage instruments. Admission is $10 per day.

Show hours are from 10 a.m. to 6 p.m. Saturday and from 10 a.m. to 4 p.m. Sunday.