Always check the following:
The level of wear is consistent with the age and mileage of the car. Always see more than one car and compare the wear to other cars of similar mileage.
Cars with a reputation for being durable and well-built are a target for clocking.
However, the following is true of most cars:
Cars with mileage of 0 – 30,000 will have hardly any wear. Cars with mileage of 30,000 - 60,000 can be expected to have some minor scuffs on plastic and very slight creasing or fraying on seat squabs.
Cars with mileage of 60,000 – 90,0000 will have more scuffing and fabric creases or fraying. Seats may have begun to sag slightly. The ceiling of the car and light trim may also be slightly dirty or marked. Some plastics will be a little shiny in high wear places, such as control stalks, gearshift and steering wheel. Pedal rubbers will be showing signs of wear. Load areas may have some scratches.
Cars with mileage of over 90,000 will have very shiny gearshifts, control stalks and steering wheels, and light fabrics will be marked. Some seat squabs and backrests will be creased, sagging and frayed. Pedal rubbers will be significantly worn. Load areas will be scratched.
Check that the mileometer numbers are in line. If not, the mileometer may have been adjusted. The data check, combined with a thorough check of paperwork should help confirm or dispel any concerns about clocking.