Each star on the obverse represents one of the Swiss "states", or cantons. There are 23 on this coin, representing the 23 "full cantons" of Switzerland.
Prior to 1983, there were only 22 stars. In 1979, the half-canton of Jura was promoted to full cantonship, and the 23rd star was therefore added to the coins a few years later.
A constitutional revision in 1999 abolished the status of "half-canton", promoting the six remaining half-cantons to full cantonship and giving Switzerland the 26 cantons it has today. The number of stars on the coins remains at 23, however; the former half-cantons are now officially called "cantons with half of a cantonal vote" in the new constitution. So it was more a change in label, than a change in status.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis