This is a strange one, supposedly KM# 505. Brasil 400 Reis MCMI (1901) 30mm 11.73gr Cu-Ni.

This piece however is brand new, weighs 12.2gr and bizarrely enough passes the
tissue test when placed next to a known silver coin.
This piece only fetches $30.00 in UNC, so it's an unlikely target for counterfeiters. Any ideas what I've got here?
Bob
Moved to World Varieties/errors forum - Sap