I'm gonna say a 1930s vintage Regulation Police. Additional info that would be helpful;
1) barrel length - measure from cylinder face to muzzle
2) finish - blue or nickel?
3) grips - metal medallion @ top or no, do they come down below the steel grip frame and end as a flat surface?
You say it appears unfired, is there anything else with the gun, such as the original box, tools or instructions? All of this adds to the value.
As has been said, pictures are nice!
Oh yeah, welcome to the forum!