The T206 Honus Wagner card is probably the rarest and most valuable, but there are 1/1 inserts, which means only one has ever been made. But they don't come close to the value of the Honus Wagner. the Babe Ruth Rookie card is the rarest.
One of the first cards ever made was recently discovered by a 72 year old Californian woman. the card is from 1869 picturing the first professional baseball team, the Cincinnati Red Stockings. She almost sold the card on eBay for $10. The card is estimated to sell for at least five or six figures at auction.
Another card more rare than the T-206 Honus Wagner baseball card is the 1921 Frederick Foto Babe Ruth card. There are three known examples.
It is technically any card numbered 1/1 as only 1 copy of the card exists but current and rapid production of these cards have decreased the rarity and meaning of a 1/1 card.
Technically it is any card numbered 1/1 since there is only one copy in the world but modern production has devalued the meaning of a 1/1 card.
Rogers Hornsby, Lou Gehrig,Babe Ruth, Jakie Robinson, Jimmie Fox, Cy Young, Nolan Ryan, Sandy Koufax,
transcend memory card is most popular
The top selling baseball card would be a card that is popular, and in high demand, plenty on the market, and would most likely have a relatively low value. You would need to go on eBay to find out this information. This would be the card that is listed, and sold the most. If you mean "what is the most expensive baseball card?" see Related Questions below for the answer.
MicroSDHC card
Baseball is very popular. It is most popular in the United States. It is a game loved by Americans (and most other people) of all ages.
Venezuela's most popular sport is baseball.
the most valuable barry bonds baseball card is probably his topps rookie card
this site (FreshDeals.com) Greetings' most popular card are the Hallmark series, which sell especially well during the holidays.
Christopher Rectumski's rookie card
poker
Baseball. It's Americas sport although skateboarding is one of the most popular extreme sports
The most popular sport in America would have to be baseball.
hank aaron