Antiques

[Phil C]

Anne as stated all firearms can only be considered an antique if made in 1898 or prior. I am assuming that you are under the impression that the shotgun becomes an antique once it becomes 100 years old.
The value of your shotgun is not in the collectability but in functionality. The person that will buy this gun will buy it with the intention of using it. The VH parkers are not rare, high original condition ones are desirable. Smaller gauges generally are more valuable than 12 gauges.
PGCA has records on many of the guns manufactured. Providing the serial number will allow us to look up the original configuration.
What is meant by Cleaned Up means work has been done to alter the original finish. For example if you had an antique dresser that had the original finish and patina cleaned off it, it is going to be less valuable than one that has been cared for in high condition with the original finish.
Most critical is the condition of the bores. If they are safe then most everything else can be repaired if needed.
Anne no one can provide an honest dollar value over the internet, there are just to many variables.
The best way to proceed is to have one of members here recommend a respected qualified gunsmith in your area to evaluate this particular Parker and advise you on its value.