Not my dad's first, but his last duty revolver. A no dash 686.
Dads first duty revolver was a model 66 with a 4 inch barrel, that he had bought with his own money. He carried it for years. When he was issued the 686, he gave the department his model 66 when he should have kept it. Later they gave him this 2 1/2 barrel model 66 no dash to make things even.
