The 1908 Silver 5 Mark “Jena University” coin from the German Empire’s Saxe-Weimar-Eisenach state is a highly collectible commemorative piece. Struck at the Berlin Mint (mintmark “A”), it was issued to celebrate the 350th anniversary of the University of Jena. The coin features a silver composition of 90% purity, weighs approximately 27.78 grams, and has a diameter of 38 mm. The obverse typically depicts Grand Duke William Ernest of Saxe-Weimar-Eisenach, while the reverse displays a crowned imperial eagle with a shield on its breast, symbolizing the state.​

The coin is cataloged as KM#220 and known for the “J-161” die variety, which collectors often seek due to its distinct die features and historical significance. Its edge usually bears the inscription “GOTT MIT UNS” (“God With Us”). The mintage was about 40,000, making it relatively scarce compared to more common German Empire coins. This low mintage combined with its commemorative nature enhances its numismatic value.​

In terms of condition, pieces graded by PCGS with “UNC Details” indicate the coin is uncirculated but may have some issues such as environmental marks or minor contact that do not detract significantly from its overall eye appeal. Notably, you mentioned it “doesn’t look at all cleaned,” which positively impacts desirability since original surfaces are preferred over cleaned or altered coins in the collector market.​

Auction results show that the coin can command prices varying from approximately $240 to over $300 depending on grade and eye appeal. Higher-grade examples with original toning or provenance sometimes fetch even higher prices. The coin remains a popular choice with collectors of German Empire and university commemorative coins due to its detailed design and historical background.​

In summary, the 1908 5 Mark Silver “Jena University” coin is a notable commemorative German Empire coin with 90% silver, struck in limited numbers for the university’s anniversary. The PCGS UNC Details designation with original surfaces adds value, and the coin is sought after by collectors specialized in German states and commemoratives for its historical and numismatic significance.​