These blank cartridges in 7,62 x 51 were the first ones to be adopted by the Spanish Army. Circa 1973 they were prohibited for use in machineguns, being suspected of developing extra high pressures that lead to the breaking of barrels. This suspicion led to the banning of the use of wooden-bulleted blanks with blank firing attachments, too.
The machine gun then in service in Spain was named MG 42/58, and was a Spanish version of the well known German gun.
After the banning of these cartridges, called “the Norwegian ones”, Spanish switched to the khaki-coloured DAG plastic blanks, and later to the Oramil products.
Note that this cartridge corresponds to the 1956 Lars Ringdal pattern, except for:
The primer pocket is Berdan in the patent, and
The aluminum tube is tapered at the end in the patent.
The steel base piece is found in either dull aluminum-coated steel or copper-washed steel. They have a small raised numeral in the lower part of the plastic case.