I recently purchased engineer boots and have three pairs, so I'm putting them up for sale. They have scratches in various places, and the heels of the soles are quite worn down. However, the leather itself is well-nourished and moisturized with Mustang paste and mink oil, so I think they can still be worn for a long time. I heard that Red Wing is not currently producing engineer boots, so they may increase in value in the future, so please consider them if you like them. Please comment if you have any questions.