Some of my favorite vintage boots are the Coach "Monet" over-the-knee style. A couple of pairs have sold on eBay recently for drastically different prices.
This size 8.5 pair sold for $59.99, a good price considering the extensive wear on the soles and toes.
Someone got an amazing deal on these same boots in a size 8 for only $7.50 plus $10.50 shipping! These were also very worn on the soles and heels, but still a steal at $7.50!
My other favorite Coach over-the-knee boots, in a style called "Allyson" were listed with a Buy It Now price of $80.00 but sold for a Best Offer. These size 7 boots were made in Italy and feature high stacked heels and actually look better cuffed than uncuffed.
I first saw these boots in Macy's on Michigan Avenue in Chicago and bought a pair on eBay before reselling them later. These boots feature buttery soft leather and originally retailed for $698!