You can select which barrel fires first.
Browning Citori 12 gage over and under & a Browning Goldtrigger Light Twelve: How much are they worth?
100-1000 usd
Depends upon condition, area of the country it's for sale, and what type Citori it is.
Basic instructions can be found in the Citori Owners manual at the link below.
It will be marked on the botton of the receiver.
In your question, you answer your question.
Browning began producing the Citori White Lightning model in 2015. It is a versatile over/under shotgun known for its lightweight design and classic aesthetics.
50-550 usd
1997 You will have to call Browning
Browning.com has a sn function under customer service
Go to Browning.com and look under customer service.
If you mean a Citori; 100-5000 USD