By the serial number.
The barrel will be marked "Made in Belgium"
It will be marked "Made in Belgium"
You will have to call Browning.
Sometimes by the complete sn, sometimes by the action and features.
The barrel will have 'Made in Belgium' on it. The receiver can be dated by serial number.
take it to a gunsmith
Comparison to known grades.
Serial number. Go to Browning's site, click on support, then date your firearm.
Call Browning
Browning did not make the Luger
Yes, Browning has made the Superposed Lightning in Belgium.
Call Browning, give them the serial number, and they will tell you the age and a host of other information about your gun.