There are many factors that contribute to the value of a collector plate. The most important factor is typically the age of the plate. Antique plates from the early 1900s can be worth thousands of dollars. The condition of the plate is also important – a pristine plate in mint condition will be worth more than one with chips or cracks. The rarity of the plate also plays a role in its value – if there are only a handful of known examples, it will be worth more than a plate that was mass-produced. Finally, the provenance (or history) of the plate can add to its value – for example, a plate that belonged to a famous celebrity or historical figure would be worth more than one without any notable provenance.