Browning.com has a sn function on their web site that you can use.
To determine the year of manufacture for a Browning Citori 12 gauge shotgun with the serial number 17669NX753, you can refer to Browning's serial number lookup charts. The "NX" prefix indicates that the shotgun was manufactured in 1993. Thus, the year of manufacture for this specific shotgun is 1993.
On the receiver.
1980
1985
A citori 325
1986
i would go to the browning web site.Click on the customer service link and there should be a spot were you can research your browning citori lightning.
1982
This is a 12ga made in 1973. It is the first year of production for the Citori Model.
It will be marked on the botton of the receiver.
In your question, you answer your question.
solder