Basically impossible to value with just the model description.
100- multiple thousands depending on specifics.
100-600 USD
In 90%+ condition about $700 for a 20 gauge and about $550-$600 for a 12 gauge.
The value of a 12 gauge Browning Citori Pigeon Grade is actually dependent upon a number of factors. Some of these factors would be the age and condition.
Without more specific information on the fininsh and condition; 100-1000 USD
1000 USD
100-1000 usd
100-1000 and up depending on specifics
A Browning citori model 525 sporting in grade I configuration will be valued at between 575-1,200 dollars based on your shotgun having between 60%-90% of its original finish remaining,and a good set of bores.
800-1100 USD or so
Are we talking about a auto-5 shotgun,or a BPS(browning pump shotgun),or a over-under shotgun(citori, or superposed)These answers would help me determine the value of your shotgun which was made in 1980.
Requires professional appraisal