1797, German States, Aachen (Free City). Copper 12 Heller Coin. VF+ Condition: VF+ Mint Year: 1797 Mint place: Aachen Reference: KM-51. Denomination: 12 Heller Material: Copper Diameter: 25mm Weight: 3.99gm Aachen also known as Bad Aachen (Ripuarian: Óche, Limburgish: Aoke, French: Aix-La-Chapelle, Italian: Aquisgrana, Dutch: Aken, Spanish: Aquisgrán, Latin: Aquisgranum) is a spa ...