Depending on condition and exact version, anywhere from $2,000 to $4,000. You are going to need a "hands on" assessment.
50-125
5-90 usd
50-125
50-100 USD
50-140 or so
50-125
0-100 USD or so
Impossible to answer without a detailed description and the overall condition.
25-125 usd
H&R and New England Firearms are one in the same, NEF holds licence to the old Harrington & Richardson brand names, if it is a H&R Huntsman 45 caliber black powder single shot rifle 28" round barrel then the value is in the $100 to 125 range in 90%+ condition.
Usually in the $300-$600 range
50-125