Also see the TV history site:
http://tvhistory.tv/1946-49-GE.htm
My old price book* (from 1999) lists several GE models, some examples:
800 bakelite 10" $125, 806 mahog 10" $75, 807 blond 10" $85, 815 mahog 10" $40, 821 Mahog 12" $40, 830 mahog 12" $70. perhaps multiply these values by 2-4x?
jr
*Televisions Identification and Values by Brian Durbal & Glenn Bubenheimer... (Still available on Amazon)