Theoretically, yes. For instance, it could be stolen by an employee. However, such a gun would be illegal to sell in most countries.
In US, there are some guns that may be made legally without serial numbers. It is legal for any person to manufacture a firearm for their own use, provided they are not barred from owning guns by law and the firearm in question does not fall under NFA regulation. Such guns do not need serial numbers.
Impossible to answer without the serial number. Call S&W and they will tell you when it was shipped from the factory.
Without providing the serial number there is no way to tell. The Model 66 began production in 1971. Call S&W with the serial number and they will tell you when it left the factory.
No way to tell from just the serial number.
Impossible to answer without the serial number. Call S&W and they will tell you for free when it left the factory.
Without the serial number the question can't be answered. Call S&W with the sn and they will tell you when it shipped from the factory
Call Ruger and they will tell you when it left the factory.
No way to answer without the serial number.
Impossible to answer without knowing make or serial number.
Impossible to answer without the serial number.
No sn data outside the factory
You will have to call the factory with the serial number to find out.
By asking the factory to check their records on that serial number revolver. It may cost for the research.