9cm face. Thats 3.5 inch. Total 10.2cm / 4 inch. Number on the back is 94920 W9. Ward La France, Kenworth, Peterbilt. Maybach. Anything big or racy. Nice chrome , no dents. Reflections are from photo. Worldwide postage 20 euro.
Nice original Lucas inspection lamp as used on Rolls-Royce & Bentley cars from the 20s to the 50s. Lots of patina, or, in other words, very little plating left on it. Could probably do with rewiring.