A new old stock Rotor Arm, F. Claudet (FC) reference FC 1011 marked Made in England this is equivalent to Lucas 400822 for DJ4A and DJH4-4A clockwise distributors (as always with distributors, anti clockwise or clockwise as viewed from the underneath, not from the top).
Period shape with period long lead in, probably made in the 1940's or early 50's.
N.B. Please note last photo which shows the underneath of the rotor. Note the wide 'lug' at the front inside. Later models had a different rotor with a narrower 'lug' at the back inside. Please compare to your old rotor to be sure that this is correct for your vehicle.
Please note top and bottom surface of the metal appears to have a silvered finish not noticeable in the photo but the edge had the brass colour you would expect.
F. Claudet was an old brand based in Bedfordshire providing after market ignition and other car parts. They were still around in 1973 when they exhibited at the Motor Show but my research cannot find any mention of them after then.
For the following vehicles:
AUSTIN Heavy 12/4 1933-34 some, please check against shape and direction of your old rotor
BSA 10 1932-34
LANCHESTER 10 1932-33
MORRIS T 1 ton and L 15cwt, C 4-cyl 1933-34
Morris Cowley Van, Rover 10, Standard 10 and 12/4 Wolseley 9 all only for year 1934