13 yrs old. 800-1000 USD
I don't think there is an invector plus model. Invector Plus is the choke system Browning uses on newer shotguns.
500 USD or so
Either Invector or Invector+ depending on how it left the factory.
Browning did not make an Invector model. That is the type choke system of the shotgun.
Need date of mfg, serial number, and condition to price most any firearm.
Browning's web site has the current information.
You will have to call Browning to find out.
The Invector Choke system was first introduced in 1983 and only available on Citori, BPS, and BT-99 models. Fixed choke barrels were still available as well. Please note that the Citori Lightning model wasn't introduced until 1988. All Citori Lightning models in 12, 16, and 20ga. were only available with the invector choke system (and still are). 28ga Lightning Citori's were still fixed choke only.
What is the question?
10-20 usd
Depending on condition $300-$450
Go to Browning.com and type "Invector Choke" in the search function.