1. See what it sells for (and has sold for) on GunBroker and similar gun auction sites.
2. Ask in a gun forum.
the people who evaluate antique guns have a refence guide/book they use. they also need the gun 'in hand' to note the condition for themselves. based on their findings, they can attach a value to an antique piece..........in a lesser way, you, too, can evalute an antique pistol by securing an antique gun book and compare your pistol to the condition they list. buy a copy of "bluebook of gun values" thru Yahoo or your book store.
It would be best to take it to a gun shop to have it Identified.
No
Really not possible to answer without gun in hand. Value of antique arms is driven by condition.
No way we can give you a meaningful answer- sort of like "What is a Ford Truck worth?" Value of ANY gun is based on make, model, and condition. The Tranter was a British revolver, and may likely be an antique firearm (Made prior to 1899 is the legal definition of antique firearm in the US) This will require an hands-on evaluation by someone knowledgeable in antique European arms. Your best bet may be to visit a gun show in your area, where dealers and collectors are gathered in one handy location. Wish we could help more- sorry.
In the case of a bonafide antique firearm, condition is everything. The difference between a 75 percent gun and a 95 percent gun is double the value. Yours could be anywhere from $1,500 to $3,000 US dollars. Your best answer will come from a licensed antique firearms appraiser. You could also visit a gun show in your area, where dealers and collectors are gathered in one location for your convenience. And congratulations on a nice bit of history.
If this is a moderm manufacture gun, the company will provide an owner's manual which will have disassembly instructions. Contact them at their web site. If this is an antique gun, you are best advised to not disassemble it if you don't know what you are doing. You can damage it and significantly reduce its value if you take it apart incorrectly.
The value of an antique gun is determined by a number of factors including age, condition, documentation, etc. You should check out the NRA Condition Grading Definitions For Antique Firearms. You can find these by using the Google search form to the right. To get a reliable estimate of the value of your gun, see a professional appraiser. If you just want a basic estimate, buy yourself the current Blue Book of Gun Values. Of course, ultimately the value of anything is what it is worth to individuals. What is it worth to you? What is it worth to an individual potential buyer. The gun may be worth more to you because it has sentimental value, e.g. it was your grandfather's gun.
Value of ANY gun will be based on condition- and in the case of an antique, originality. DO NOT clean up an antique- what you call dirt, collectors call patina. There is no way to give a value without a hands-on assessment by a person that knows antique British pistols. It may be $50, or $500.
All I can tell you is this gun was made by Daisy. Daisy offers a free service to determine the value and history of Daisy antique air guns. See the link below.
Gun shop, gun show, antique gun forum, or possibly Flayderman's Guide to Antique Firearms.
In the case of a collectible firearm, a HUGE part of the value is based on condition and originality. It is impossible to offer a value without a hands on appraisal of the firearm. You need to find a dealer in collectible antique arms to examine the gun, and give you a valuation- it is simply not passible at long distance.