No way to answer the question without the serial number.
With the V8 suffix to your serial number.Your Browning B25 shotgun was made in the Year 1968.
The mv letters in the serial number that you provided indicates that your browning c2g model B25 was made in 2005.
Browning now offers history letters. If you call them they will tell you.
Check with Browning Customer Service through their website.
1984
Browning.com has a sn function under customer service.
The suffix of S7 to your serial number indicates that your Browning B-25 shotgun was made in the year 1967.
You will have to call Browning
If you go to the browning web site there is a help section under the customer service site that will age your browning B-25.
100-1500 USD depending on specifics
Superposed