I have two of these and trying to get an idea of manufacturing date and an approximate value.
1. Ser# D36xxx Model 10-5 believe barrel is 3.5" tapered. Blue some pitting and a few nicks on handles.

2. Ser# K 351xxx Mod 14 6" barrel, blue. Decent condition


Trying to get a general idea for my sister in law..

Welcome to the forum.

D36083 is from the late 1960's.
K351004 is from the late 1950's.

__________________
"I also cook."

The K351004 should be a relatively early 4-screw frame. Without
seeing pictures, your phrase "decent condition" is not really sufficient
to estimate a price. Maybe its a $400 to $450 gun. The D-serial
number gun is more of a shooter, as they made so many of them.
Maybe its $250 to $300.

Mike Priwer