The post-war Mauser HSc is interesting.
In 1967, a re-constituted Mauser-Werke returned to Oberndorf, and from October 1968 to December 1977, a total of 63,118 new HSc pistols were manufactured. 18,868 were made in 7.65mm with a serial number range of 00.101 to 00.19868, and 39,250 in 9mm Kurz with a serial range of 01.1001 to 01.40250. A special group of 5,000 in those two calibers, the "American Eagle" edition, brought this series to a close. My .380 pistol, illustrated here, was made in 1975.
That's about all I can tell you about the post-war serial numbers.
Some clues to the manufacture date of your pistol can be found here:
The Post War Mauser HSc pistol: A closer look.
John
(click for larger picture)