Ron: You might want to order the research letter to see what the surviving factory records indicate. As Dean pointed out, the gun started life as a Grade 2 (G) and along the way had a major face-lift.
If you have the right tools and skills, you could remove the trigger guard screw, lift the tang and rotate counter-clockwise approx 1/8 turn and see if a serial number is under there and if it matches or not. I suspect not, but never say never.
The price of the letter may be worth satisfying "some" of your curiosity. There will likely still be more questions.
Cheers,
Jack
This image courtesy of another thread on revealing the serial number under the tang.
