Your HSc was produced in 1977 as part of the "American Eagle Edition". This was the final 5,000 HSc's to come out of the Mauser factory in Oberndorf, Germany and celebrated the American Bicentennial. As such, The Great Seal of the United States of America is etched into the right side of the Slide and the Interarms import information was placed on the frontstrap of the Grip. At this time, Mauser was a final assembly operation since most of the parts of the HSc were made primarily in France by Manurhin. The Magazines were produced in The Netherlands.
You have to decide if you think this 40-year-old pistol is, or will become, a collectible in the future. I have to say that in my experience, in .380 caliber the HSc does have a tendency to break parts, so anticipate this when and if you take it to the range. Replacement parts could get expensive. Hope all this helps and let me know if there is anything else.