I have this set of 3 Oldfield Lamps.
The pair for the front are labelled 4712/1910 and are sprung. These are the large size that would suit a larger engine.
The rear is smaller and unsprung.
All three lamps are complete and in original unmolested condition. The rear is perhaps the poorer of the three as there is a small part of the bezel missing (visible in the photos). However they are usable as is. Obviously if you want to restore them you could.
Please ring 07871 577 132,
hedd_jones@yahoo.co.uk or PM me for further details