A unique style on the early classic Mini and Morris Minor feature is the stalk-mounted turn signal indicator; 47H5200 is the lens, GLB280 is the little-bitty screw-in bulb. This bulb is also found in the illuminated rocker type switches on later classic Minis (1976-on). 12V 1.5W. This bulb supercedes bulb GLB921 (12V 0.75W). Ref: 280, LLB280, GLB280, GLB921.
See also 31945 for turn signal switch assembly.