Ernest, there are at least 3 "types/qualities" of the classic 501s. First there is the standard "Red Tab" 501s, which you find everywhere, then there is the "Premium" 501s, which is different mainly because of the washes/effects on the denim. Lastly, and most different is the "Levis Vintage Clothing" 501s. These are made in the USA using original selvedge denim from the original source. There are different fits according to the model year: eg. 1933 fits very different from 1966. These are the best 501s in terms of quality, and "originality"