Great photos ^ I believe that's the pair that sold for $400,000 last year - https://bid.juliensauctions.com/lot-details/index/catalog/471/lot/213725/NIRVANA-KURT-COBAIN-PHOTO-MATCHED-STAGE-WORN-AND-EVENT-WORN-LEVIS (better photos in the article)
If I had to guess, looks like ~1970 big E?