The restoration of an antique, if done properly, will enhance its value. If not, the value will be negatively impacted.
Shown below: A Whimsical Cloisonné Dog:
List price: $46,450 USD.
Shown below: A real dog. This is Molly. She belongs to Buzz and Jim and is sometimes mistaken for a tick. She's 9 years old and will be an antique in 91 years.