I dont grow many really early varieites, but I have grown a Russian variety called Azoychka..It is a heirlloom with fruits that are yellow/orange in color, and the fruit has a wonderful, sweet, citrusy taste .Meaty.. Good acid balance of flavor. Around 3 inches, 8 to 16 oz for me. It was pretty productive. Was one of my earliest at around 66 days.
I know someone who is growing Mrs Maxwell's Big Italian. It is an early season heirloom about 69 days... Fruit is 3-4 inch, dark pink beefsteak, around #1 to #2 . Supposed to have really great flavor. She ordered her seed's from Tomatofest..If they do well for her, she will save seed and give me some for next season..
Others I know that have grown some earlies and gave great reviews..Pink Honey, (aka Rozovyi Myod, a russian variety), 1-3 # fruits with a sweet flavor, It is on my grow list for this year.
Korol Sibiri,(King Of Siberia) early, 7 ounces, yellow heart shape type, few seeds excellent taste
Grushovka, Break O Day, Moskovich, Anna Russian, Matina
Illini Star: Not a heirloom, but new open pollinated variety. Indet., Reg. leaf, Large yields of 6-8 oz. red tomato with excellent sweet flavor..
HTH
Ginny