Congratulations on your gift and welcome to the Forum! Your Early Wartime German Army or Heerwas made in June 1941, just six months after production began. As you can see on the Production Chart, the Army was the largest buyer of the HSc during WWII.
Hopefully, all three serial numbers match on your pistol. Look for them on the Barrel Breech, nose of the Slide, and, of course, on the Frame bottom of the Grip. These Early Wartime pistols are prized by collectors because of their fine finish and precise construction. As the war progressed quality was sacrificed for output to a certain extent.
If there is anything else, let me know.