Ned help identifying stamps

Robert Crankshaw

Need help identifying these stamps.

Scott # please

Michael Generali

Not in Scott. Look like revenues or similar.

Robert Crankshaw

OK

Thanks

Lauren Cochrane

The first stamp looks like a Hungarian revenue with a 50 filler overprint.
Citta di Piombino translates to: City of Piombino (Italy). Guerra is the word for war. So, local war tax stamp.
The third stamp looks like its from Nepal.
D.S.B is the Danish state railway. https://www.paperheritage.co.uk/rls/DSB.html