Levi's 20517-0217 bootcut denim from around the 1980s. This pair, featuring an orange tab, has over 90% of its color remaining, in a deep indigo mint condition. I think it's becoming less and less common to see such a dark pair in this condition, aside from deadstock. The inner tag is paper, and the back of the button is difficult to see, but it appears to be either 385 or 585. There's a bit of whisker fading.