47H5122/BFS207. Original BMC Side Lamp Bulb. Stamped BMC ‘Made in England’. 

This bulb is: 12V (volt), 5W (watt), single contact.

Dimensions:

• Height: 1-¹/₄” (33mm)
• Diameter: ⁵/₈” – 2 pin fitting.

See item number 10 in the illustration. 

Fitted to tractors:

• Nuffield: 10/42 – 10/60
• BMC Mini
• Nuffield: 4/25
• Leyland: 154