Hahnrei Thaler
The word means a cuckold and it is usually applied to a class of medallic Thaler which have obscene inscriptions.
It is also used to designate a Thaler struck by Philip Reinhard I, Earl of Solms, in 1627 from silver found in the fortress of Wolfenbuttel, and dedicated to Christian IV of Denmark.
Source: Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)