Slim Chance,
Great gun!
The 14-3 was first made in 1967 and the first 14-4 was made in 1977.
If you post the serial number using xxx for the last three digets I should be able to give you the year. Example: K623xxx.
I have two of these guns one is a pre-14 or K-38 Target Masterpiece from 1950, the other is a newer from the 1990's. I have not shot the newer one but the oldie is a fine shooter. I am confident that you will enjoy yours.
The recommended diet for the gun is 148 Gr hollow base wadcutters.
Good luck,
Fred