Contact Browning Firearms Customer Service. Many of the FN records were lost during the war.
No way to answer without the caliber.
Sorry but we would need the serial number to answer.
1920
1927
1918
No published sn data
1958
1950
The year of manufacture for serial number 25035 is 1947.
1920 (no date code stamp)
The gun was made in 1941 You can research dates of manufacture by going to: http://armscollectors.com/sn/winlookup.php
1890 for light frame .22rf caliber and 1886 for mediam frame .32, .38 & .44 caliber