The following weapons were used in the film Marnie:
Smith & Wesson Model 10
Marnie Edgar ('Tippi' Hedren) takes a Smith & Wesson Model 10 from a woman in a farmhouse to shoot Fario, Marnie's injured horse.
Smith & Wesson Model 10 - .38 Special
Marnie carries the revolver
Marnie cocks and fires the Model 10. Note the difference in quality, due to the lower image being shot on a rear projection screen in a studio. It also appears that Marnie's glove has changed.
Marnie sets the Model 10 down on a table.