you could be looking at a Meteor MK IV and think it's an "N" this model was produced from 1973-1977. Or you could ask BSA directly at the link below.
Santa barbara if its marked spain on receiver
A Browning BAR grade IV rifle which was discontinued in 1984 will bring between 915-1,775 dollars for a rifle showing between 60%-90% of it,s original finish remaining and a good bore.
The Mk IV 380 is a Colt Government Model .380 caliber compact semi-automatic pistol with many of the features of the time tested Government Model .45.
$900
100-800 USD
Call Colt, they will tell you.
Today, Roman numerals are used mostly for formal copyright dates, and as "Model designation" for manufactured objects as "The Such-and-such Model IV, Model V", etc
Data not available in the public domain.
100-800 usd
No way to answer without a serial number.
proofhouse.com