The following .450 headstamp came to light in 1994 in Argentina. To my knowledge it was the only one known at that time. Another turned up recently in Australia.
I suspect this is European manufacture for export to a Spanish-speaking country (even though one turned up “Down Under”).
Has anyone seen this headstamp on any other caliber? Has anyone seen a box? Does anyone know if the “El Sol” trade mark was registered anywhere?