Zufallsfund- Top Jugendstil NATIONAL RegistrierkasseIts from 1912 and the 902 Mark inside are from 1914 or earlier. This baby had been used for 2 years only, until it went straight into the attic. This cash register is virtually NIB. It comes with a lot of documents about its purchase and letters about payment issues.
The money would be worth more than 10,000 EUR today! But since it is not allowed anymore (since 1914 actually) to change that money into gold, it has only a collectible value.
If it wouldn't be so expansive, I would go for it.
ps: has someone got a time machine, so I could go and change the bank notes into real money (Goldmark)?