I have the same shotgun . Yours seems to have been built in 1989 correct that to 1978 The guns made in the 80s were just Citori . No model number attached to them yet like 725 etc .
To find what fixed chokes you have ,break open the action and it will be marked at on the left side of the barrels just above and below the ejectors .
* means full choke ** means modified choke etc.
If you have screwed in chokes they are marked on the end of the chokes with little groves 1 Grove -Full
2 groves modified etc
If you have a grade 1 you should have some fancy designs on the sides of receiver
If its not a grade 1 it will just be a black receiver with no designs .
I gather a high grade will have some birds engraved .
The wording special steel might be on your barrel . This does not mean you can use steel shot . Stay away from that .
This site might help you .
https://www.midwestgunworks.com/know...ToT-aW1-jx2v5o