> This has to be extremely rare. Was this primarily out of the US that the
> single headlight was used then?
In 57, there were some states that did not allow multiple headlights i.e. 4
of them, so the factories started out the year with single headlight models.
A few, such as Imperial, Chrysler, DeSoto, and Mercury, built mid year
options with 4 head lights instead of two. There were some after market 4
headlight units for 57 Fords. Therre were some faux 4 headlight systems,
Lincoln, Plymouth and Dodge, in 57. In 58, I think the only American cars
without 4 headlights were Studebaker and Packard.