OK, it does not have a grade stamp. Now, assuming the gun retains the original stock, remove the screw/s from the trigger guard strap; lift up the strap and look for the stamped serial number beneath same (in the wood). If the stock wood is original, there should be a grade stamp in the wood with the serial number. Check and advise.
Finally, since you can post photos; post photos of the engraving on the frame. If it is an upgraded Ideal pattern, one of us can probably spot the differences. Also, what are the barrel steel stamps on the barrels? Advise.