That Carina would have had sealed beams in its home Japanese market, but European-type headlamps were put in cars exported to countries where that type was either required or most commonly used. That's an R2 bulb you've linked. Tungsten non-halogen, 45/40w high/low beam in 6- and 12-volt versions; 55/50w in the 24-volt version used in European trucks and buses. It was almost 100% universal in European headlamps (that is, headlamps built to comply with the European regs, no matter who built them or where) starting in 1957. This bulb came in white and
selective yellow.
When the Brits and Europeans devised the world's first halogen 2-filament (high/low beam) headlight bulb, the H4, in the late 1960s, they kept the filament geometry compatible with that of the R2, so it was an easy matter to make hybrid bulbs: an H4 burner on an R2 base. Thus were old headlamps updated to halogen technology just by changing the bulb.