Actually, I think your Dad's revolver is a Victory Model of the Military & Police Revolver- the M&P was the name BEFORE they started numbering models. If the serial number on the butt starts with a V, that be it. As said, these were made in .38 S&W, AND in .38 S&W Special. Two different cartridges.
Here is an owner's manual for your revolver- all 4 pages of it. http://stevespages.com/pdf/s&w_10.pdf
There is NOTHING to remove or take apart for owner's level maintenance on these. Your basic tool will be light oil, cloth, and wipe/rub. Your revolver appears to be Parkerized- this is a dull, gray/green phosphate finish used on military arms- it will not be the bright shiny blue/black of a civilian arm- and that is normal.
I cannot tell you if the gun is safe to fire- not at long range- but these were well made, durable, reliable- and it SHOULD be safe to fire- but have a pistolsmith or an experienced revolver shooter take a look at it. Be sure you are using the correct caliber ammo- 38 S&W, and 38 S&W Special do not interchange.
IF you ever want to dispose of it, there are several people here that would walk all over their friends to buy it from you. I have a Collector's Federal Firearm license, and would be glad to discuss it with you myself- as would many a WW 2 re-enactor.
If you are not familiar with the legalities of selling firearms, the important thing to know is that if the ownership is being transferred across a state line OTHER than by inheritance, the firearm needs to be shipped TO a Federal Firearms License holder (FFL), either a Dealer or Collector, in the home state of the recipient.