Depends on what the rifle is, and whether or not you can trace it to the actual manufacturer. Interarms was an importer and distributor - not a manufacturer.
Interarms did not make it. Probably chinese
No way to tell without a detailed description
Serial number
To determine the date of manufacture of a Mossberg rifle, you can look for the serial number on the firearm. Mossberg typically uses a combination of letters and numbers in their serial numbers. By contacting Mossberg directly or utilizing online resources that catalog Mossberg serial numbers and their corresponding manufacturing dates, you can accurately determine when the rifle was made. Keep in mind that the format and location of the serial number may vary depending on the specific model of Mossberg rifle.
Serial number and features.
Usually by the serial number.
We can't tell without the serial number- but if you go to the Ruger website, under Customer Service, you can see the year of manufacture for serial numbers. You will need the spefic model of your rifle.
Serial number and or proof marks
First, it would help to figure what the rifle itself is - the serial number does not tell that.
No way to tell just by the serial number.
Usually by the serial number.
Not unless you tell if it is a rifle or pistol and who made it.