Harrington & Richardson (H&R) the maker of the Topper shotgun, was located in Worcester Mass.
Try e-gunparts.com
1970serial#72681
Try e-gunparts.com
Try e-gunparts.com
50-160 USD
1979
6 hr 50 min
50-100 USD
No sn data published
10-100 USD or so
Impossible to tell without knowing how long it took to drive.
50-150 USD