Saxony 1905-E 20 mark
This specimen was lot 3888 in Goldberg sale 69 (Los Angeles, May, 2012), where it sold for $529. The catalog description  noted, "German States - Saxony. 20 Marks, 1905-E. Friedrich August III. NGC graded MS-63." This type was struck 1905 and 1913-14 at the Muldenhutten mint and is priced about double that a common issue from Prussia or Bavaria.
Recorded mintage: 500,000.
Specification: 7.96 g, .900 fine gold, .230 troy oz AGW.
Catalog reference: Fr-3848; KM-1265; J-268.
- Michael, Thomas, and Tracy L. Schmidt, Standard Catalog of World Coins, 1901-2000, 47th ed., Iola, WI: Krause Publications, 2019.
- Friedberg, Arthur L. and Ira S. Friedberg, Gold Coins of the World, From Ancient Times to the Present, 7th ed., Clifton, NJ: Coin and Currency Institute, 2003.
- Goldberg, Ira, Larry Goldberg, Stephen Harvey and Paul Rynearson, Goldberg sale 69: the Pre-Long Beach Auction, Ancient and World Coins, Los Angeles: Goldberg Coins and Collectibles, 2012.