Can anyone zero me in a bit closer on the production date of a pristine Model 34 I have? I bough the gun as a gift for my now-deceased dad about 30 years ago, going a bit over my budget and spending, as I recall, $225 for it. The yoke stamp is MOD-34. It has a 4" barrel, flat cylinder latch, round butt with diamond checkered grips, and a serial number in the 52xxx range. I-frame. I assume it was made somewhere in the 1957-1960 range, but any help in getting me closer would be appreciated.