Hello, I checked the German Notgeld (states until P) today for duplicates and found some (one of each can be deleted):
1. https://en.numista.com/catalogue/note232926.html and https://en.numista.com/catalogue/note238450.html
2. https://en.numista.com/catalogue/note238929.html and https://en.numista.com/catalogue/note229694.html
3. https://en.numista.com/catalogue/note235137.html and https://en.numista.com/catalogue/note236107.html
4. https://en.numista.com/catalogue/note235290.html and https://en.numista.com/catalogue/note236081.html
5. https://en.numista.com/catalogue/note229646.html and https://en.numista.com/catalogue/note229939.html
6. https://en.numista.com/catalogue/note216758.html and https://en.numista.com/catalogue/note217388.html
7. https://en.numista.com/catalogue/note216761.html and https://en.numista.com/catalogue/note217389.html
8. https://en.numista.com/catalogue/note232925.html and https://en.numista.com/catalogue/note230289.html
9. https://en.numista.com/catalogue/note223630.html and https://en.numista.com/catalogue/note237567.html
10. https://en.numista.com/catalogue/note209920.html and https://en.numista.com/catalogue/note238619.html
11. https://en.numista.com/catalogue/note223965.html and https://en.numista.com/catalogue/note235422.html
12. https://en.numista.com/catalogue/note227683.html and https://en.numista.com/catalogue/note237448.html
Thank you :-)