1959 Pontiac headlamp ALLOY surround ( Not alternate die cast).  Many Australian / New Zealand built 59's had cast surrounds.. the USA ones seem to have Alloy.

These are not made new and after 60+ years hard to find.

is in good overall condition but as SHOWN HERE is a small brush mark on one end that does not fault its use you may well be able to hard polish it up.. but its not crook overall.