552507 , 5-3/4" beam unit. BPF bulb
Pattern 5-3/4" beam unit. BPF bulb with pilot aperture.
Pattern 5-3/4" beam unit. BPF bulb with pilot aperture.
Pattern 5-3/4" beam unit. BPF bulb with pilot aperture, As fitted to BSA C15 and BSA Bantam D7,D10,D14,4 etc.