Since Brazil ceased being “Royal” in 1889 ( establishment of the “Estados Unidos de Brasil”) after the removal of their “Imperador”,Dom Pedro II,
the “Realengo” refers to the location of the Factory.( See “Realengo” Wikipedia, Portuguese)
“Fabrica do Realengo do municoes”
So Fabrica do Realengo is located in Realengo district, whose name may originally have meant “Royal District” for some unknown reason ( maybe a location of a Royal palace or Summer villa etc?) prior to the establishment of the Republic? Remember that for all its Colonial history, before 1889, Brazil was firstly a colony of Monarchic Portugal, and after independance from Portugal,in 1822, under Emperor Dom Pedro I, then succeeded by his son, Dom Pedro II, in 1831 as a youngster…becoming fully Emperor on his majority. See Wikipedia “Dom Pedro II”.
The FR was deactivated in 1978 ( founded 1898) and the buildings converted to Superior Schools for various Army Staff colleges.
IMBEL ( Industrias Bellicas) now manufactures all Brazil’s Military Ammo requirements. CBC ( Now Magtech) supplies both National and Commercial ammo.
“Star 5 Star” is probably an indication of the type of “cartridge” in this case, being a dummy ( Drill round) there was no need to indicate dates etc, as with normal loaded ball ammo.
Date of manufacture? At least after about 1908, when Brazil adopted the “S” type bullet replacing the older, 175 grain round nose of the 1890s.
Any of our Latin American collectors can shed more light on this item?