I missed the "Eagle K" in your description above, which would have assured police issue. This is a scarce proof and collectors would be very interested in your pistol.
Here is a recent sale of a similar pistol, although don't get too excited over the sale price of this pristine example.
http://www.rockislandauction.com/vie...id/57/lid/3516
I leave it to members specializing in police pistols to give you a ballpark value.