"Worlds Fair" was a trade name used by Hopkins & Allen of Norwich, Ct. on shotguns between 1902 & 1914. H&A went out of business in 1916.
Requires professional appraisal
Impossible to answer without a detailed description of all markings.
There is usually a serial number or a symbol stamped into the side of every carburetor. Unfortunately the only way to know is to match this up or find someone who recognizes these markings. Sometimes a web search can identify a serial number.
The number stamped on the square tang indicates the bit size.
$600-$900, depending on markings, accesories, magazine, holster, etc.
The number stamped on the square tang indicates the bit size.
Any other markings? Is it a bolt action?
Most likely the pattern number
Maybe. It's kind of hard to locate a model number in a 2000 page book without knowing which manufacturer to look under, so, could you share any other markings that you find on the gun?
Tractor serial number stamped on instrument panel name plate, Engine serial number stamped on side of engine.
if the number .925 is stamped on it also that means sterling silver if the number .999 is stamped on the ring that means it is pure silver if no numbers, i am not sure
Open the cylinder and see if there is a model number stamped on the frame. Also, how is 'ATF' marked on the gun? List the markings EXACTLY as they are and where they are on the gun. sales@countrygunsmith.net