Your serial number tells me this Early Wartime Police HSc was produced in March 1942. In Very Good condition at 95% or better finish, no chips or cracks in the Grips and if all three serial numbers match value would be $950 to $1,000.
Without any markings, the Holster is generic and probably not worth more than $50 to $75. Hopefully you are not storing the pistol in the Holster since that could be detrimental to the finish and its value.
By the way, if you can find the "Capture Paper" that authorized your Grandfather to bring this HSc back to the States, it would add $100 to $150 to its value. Anything else, let me know.