There are several models that could have that serial number, more information on type / description is needed.
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
Go to this web site, Register and then click on manufacturing dates by serial #. that should work for all Parker guns except those made by Remingtion. http://parkerguns.org/ lcj
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