Typical halogen non-sealed globes with separate removable bulb assemblies. Probably Cibie brand.
French. Bosch lens pattern (?)
Something that wasn't mentioned in previous discussion is that the sealed beam design was standardized as mandated by the US Department of Transportation or "DOT" in 1940. In fact, the rules provided for two 7" sealed tunsten-element beams. In the late '50s ('57?), the rules were amended to permit the use of four 5 3/4" sealed beams, followed by another amendment in '75 to allow for rectangular sealed beam units. Replaceable halogen bulbs did not enter the European markets until the early '60s.
Enforcement of the DOT rules was often overlooked by traffic police; however, there was a time when many US states required yearly inspections. Part of the inspection process involved testing that the headlights were properly aimed. Testing equipment measured the beam and illumination pattern found in the uniform design of the sealed beams. European lenses produced a different illumination pattern/spread and vehicles fitted with them
failed inspection. During the late '70s the rules were relaxed to permit the introduction of brighter halogen lighting, and by that time inspections seemed to be on the decline, allowing some OEM Euro-lighting to "infiltrate" the US markets.
US auto lamp manufacturers offered some sealed headlamp improvements that incorporated halogen enclosed bulbs. This, did not provide the same illumination as the OEM European market lighting, but it was a step in the right direction.
Typical North American sealed beam, with upgraded "halogen" element, available since the late '70s.
2000cs fitted with US Dot approved sealed beams
Euro version
A third, less-effective lighting alternative. Stealth illumination
Britain, Australia, and some other Commonwealth countries, as well as Japan and Sweden, also made extensive use of 7-inch sealed beams, though they were not mandated as they were in the United States. This headlamp format was not widely accepted in continental Europe, which found replaceable bulbs and variations in the size and shape of headlamps useful in car design. This led to different front-end designs for each side of the Atlantic for decades.
[4] https://en.wikipedia.org/wiki/Headlamp
Tthe accuracy of the following is unconfirmed:
The first dual-filament halogen bulb to produce both a low and a high beam, the H4 (60/55 W @ 12 V, 1650/1000 lm ±15% @ 13.2 V), was released in 1971 and quickly became the predominant headlamp bulb throughout the world except in the United States, where the H4 is still not legal for automotive use. In 1992,
Americans created their own standard for a bulb called HB2: almost identical to H4 except with more stringent constraints on filament geometry and positional variance, and power consumption and light output expressed at the US test voltage of 12.8V.
https://en.wikipedia.org/wiki/Headlamp
H1
H1 lamp assemblies
H4 bulb
Sealed beams treated with respect.
Auto bulb "types":
https://en.wikipedia.org/wiki/List_of_automotive_light_bulb_types