Choke markings , lets see , Chokemarkings , and Prints of Markings :D
Contact Browning.
Depends on how choke markings on the weapon.
BROWNING CHOKES AND THEIR CODES (ON REAR LEFT-SIDE OF BARREL)* designates full choke (F).*- designates improved modified choke (IM).** designates modified choke (M).**- designates improved cylinder choke (IC).**$ designates skeet (SK).*** designates cylinder bore (CYL).INV. designates barrel is threaded for Browning Invector choke tube system.INV. PLUS designates back-bored barrels
There is no way to tell from the serial number.
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.
You might find them in the Blue Book of Gun Values.
Mid 80's
http://www.browning.com/customerservice/qna/detail.asp?ID=100
The fixed choke markings are denoted by * marks on the bottom of the barrel under the forearm assembly. 3 on the left barrel and 4 on the right. *** Modified choke **** Improved Cylinder
Check on the barrel flats
Look on the rear left side of the barrel.F=Full,M=modified,IC=improved cylinder,C=cylinder etc.