None I have seen or heard of
50-125 USD
H&R- Harrington & Richardson.
H&R- Harrington & Richardson.
50-75 or so
Cornell Publications may have a book with sn data.
2000
50-125 or so
Sorry- not enough info to answer. The 7 shot revolvers were early guns- I have one made about 1900.
Maybe 70 USD
1980
25-150 USD or so
100 or so