I could use some advice and help. I’m looking at a Model10-5 which according to the Model 10 and Production change 5 should have a date around 1962 but the Serial# 2D3XXXX suggests a date of 1977-1978.The revolver is blued with a 6” tapered pinned barrel, squared but. Caliber is S&W 38 spl. I got this information from SCOSW 4th Edition. How to reconcile the differences? What am I missing? The condition looks excellent so I wonder if the newer production date is more realistic. It doesn’t look to be refinished.