How do you know it is a 1974 gun?
The cylinder photo shows the two Italian proofmarks. Are there any "markings" on the right side of the frame? The manufacturer date code will be either in Roman numerals or two alpha characters in a rectangle.
The third photo only shows the S/N.
Manufacturer marks: FAP in a diamond is Pietta. An octagon surrounding a U in the circle is Uberti. DGG inside a circle is Armi San Paolo. A stylized ASM in an equilateral triangle is Armi San Marco.
LRDGCO has addressed this with the links he provided.
If it has no FAP anywhere on the gun, it is not a Pietta.
BTW, welcome to the forum!
Regards,
Jim