Here we have a vintage Lucas daytime running lamp or reversing lamp which takes a festoon-type bulb.  It has the number RD954352 on the lens, which also states 'LUCAS' and 'England' as well as reminding you which way is 'Top'.

It is in excellent condition, please study photos. No cracks and responded well to a quick polish. No bulb included.

Perhaps someone has one if these and needs a spare?