My Grandpas Canvass Sky Chief Sign

I also found this in my grandpas garage when i was 7, Its a Canvass Sky Chief thats kinda rare. I have only seen one like it and it was badly faded. Ive had this sign for over 30 yrs and cherish it every day. its 59" wide and 33" high and made of Canvas. I dont know the year it was made but was told it was made right after texaco bought red indian and the green t is its clue on how old she really is. Thanks for your interest and happy hunting