A top break revolver
15-65 dollars
With a break open shotgun, the part of the gun frame that is hidden by the closed barrels.
Seek the services of a good gunsmith
No sn data I know of.
Yes, but will not function.
You need a gunsmith
The water table is the part of the receiver that the barrels of a double barrel or single shot break-action shotgun rest on.
Harrington & Richardson made a top break 7 shot 22 rf called a premier.
$75-$200, depending on condition.
1938 was the year
H&R and I believe Rossi have single shot rifles with interchangible barrels.
10-100 USD or so