This is a new old stock (NOS) original British Prefocus (BPF) or P22D base (12V 50/40W) P26J Duplo tungsten headlamp bulb in the original box, complete with inscriptions on the glass.
It is correct for Lucas PF770, original P700 and PL700 and Le Mans headlamps.
We have other yellow headlamp bulbs; contact us for the latest information.