Dr. Martens pascal mono black leather boots

Size 9. These were my go-to boots for 4-5 years so they are well loved. I consistently conditioned and polished them every fall. There is a flaw in the inside right boot. Part of the lining at the heel appears to be coming off? It may need to be glued down. They wear just fine, but can be a little annoying to put on. Black pebbled leather. Original laces.