Reminds me of some of the Bonnie inspired bags. She's a about 12"W x 8"H x 4"Deep. I love her lots! Being rehabbed at this very moment.
It was just called a Standard Tote - Coach made them in 3 sizes and yours was the largest. The style number was 9680 and it sold for $94 in 1983 which was just about the time yours was made.