Depending on condition, around $125.
50-200 USD
In really nice shape, about $125.
Impossible to answer without a detailed description of the item.
410. Have it checked by a gunsmith to verify what length 410
Why not offer the item on E Bay,with a reserve price of your own lowest estimate?.
.410 ammo
Harrington & Richardson (H&R) the maker of the Topper shotgun, was located in Worcester Mass.
Try e-gunparts.com
50-100 USD depending on condition.
About $75-90 depending on condition.
100 USD give or take