A derby is defined by open lacing: the quarters sit on top of the vamp and the eyelets flare as you loosen the lace. That small structural difference makes derbies easier to enter than a closed-lace oxford, and slightly more casual in attitude.
YoyooBlue derbies keep a British-inspired last and, where the design allows, visible stitching along the sides or welt. They are the pair we recommend when someone wants one leather shoe for office-casual and weekend walking. Colour is typically brown or black; brown hides scuffs more kindly on travel days.
New to the shape? Read Oxford vs Derby shoes and What are derby shoes?.