Barrel marking, chamber cast.
10-1000 USD depending on the specifics
10-1000 USD or so depending on specifics
Read the roll mark on the rifle.
First, you'd need to know what type of rifle it is. There's plenty of resources available online which can identify markings and such, but they tend to be oriented towards one particular type of rifle.
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The age of your winchester model 1873 is considerable.The rifle was made by winchester in the year 1885.that is 126 years ago.As to value I would have it looked at by a member of the winchester collectors assoc.or a qualified gun collector who specializes in winchesters.
Markings and features
Markings, comparative photographs, etc.
Can't be answered as asked.
Features and knowledge
You need to identify which rifle you are refering to. Also if possible, what country.
What's the question? Could you rephrase it?