Hi Bill.....welcome to TFF.
Well, you've got me a little confused here. How is your Colt marked? Please tell us all
of the writing on it, where, and exactly
as it appears.
There was an "Official Police" and there was a "Police Positive", and a "Police Positive Special", but no "Official Police Positive".
You say it's a .38. Is it .38 Special, .38 S&W, or .38 New Police?
How do you know it was made in 1933? Please give us the serial # (you can X out the last two digits, if you wish).
If your revolver was sold by Colt directly to the USMC or to a Gov't Purchasing Commission, you can find out by getting a Colt Historical Letter: