A good place to try is gunbroker.com
i have a t parker double barrel shotgun im wondering how much it is worth?
Not with just those markings. Provide a detailed description of all markings and maybe.
I have seen one listed for $1750.00
We'd have to start by figuring out what make and model it is. What markings are on the gun? email@example.com
50 USD or so
Whichever one you pull the trigger to.
Those markings suggest manufacture between 1900-1920. firstname.lastname@example.org
Parker double barrel serial #131072 what would the grade be and date made.I can say that with the serial number provided,your Parker shotgun was made in the year 1904.As to the grade,that would be impossible to say without a detailed description of the shotgun in question.you may find that there is much info available to you thru the internet about parker shotguns that will assist you in deciding which grade of Parker shotgun you have.
If there are any they usually are on the barrel close to the loading breech or above the trigger.