Courtesy of TheSamba.com
Semaphore FAQ – General
How do they work?
Semaphores are operated by a push/pull solenoid that pulls on a piston connected to the arm and lens assembly.
The upward rise of the arm is cushioned by a spring so that the action is not too strong. When the semaphore is
completely extended from the side of the car, the pointed end of the piston touches a metal contact sending a signal
to the light bulb inside your speedometer confirming that your turn indicator is on. The semaphore arm retracts into
its pocket in the side of the car under the force of gravity and a small return spring when the turn signal switch is
What color should the arms be?
The arms were always painted body color; however, the arms of replacement semaphores purchased at the dealership were black.
What is the difference between SWF and SHO?
SWF and SHO are two different manufacturers of semaphores. Parts are not interchangeable.
What is the difference between ribbed and grooved semaphores?
Ribbed semaphores were made by SWF and grooved semaphores by SHO. These two types are often confused but you can tell the difference by the:
* SWF or SHO logos on the underside of the body and/or on the lenses.
* Part numbers on the underside of the body and/or on the lenses and referring to the chart above.
* Look of the arm. For ribbed semaphores, visualize a flat surface. On the outside edges of the ribbed arm material has been added (a rib) above the flat surface of the arm. For grooved semaphores, visualize a flat surface. On the outside edges of the grooved arm material has been removed (a groove or channel) from below the flat surface of the arm.
|Year||Model and Part Number||Brand||Lens Color||Arm|
|1943-1946||20 953 021-left hand||Orange||Ribbed|
|1943-1946||20 953 022-right hand||Orange||Ribbed|
|1946-July 1949|| AL 142.001
Right and Left
Right and Left
|July 1949 -December 1953|| AL.143.001.1
111 953 021
|July 1949 -December 1953||111 953 021||SHO||Orange||Grooved|
|January 1954 -August 1957|| AL 143.001.1
111 953 021B
|January 1954 -August 1957||111 953 021A||SHO||Orange||Smooth|
|September 1957 to August 1959||111 953021D||SWF||Yellow||Smooth|
|September 1957 to August 1959||111 953 021C||SHO||Yellow||Smooth|
|September 1959-August 1961||111 953021F||SWF||Yellow||Smooth|
|September 1959-August 1961||111 953 021E||SHO||Yellow
|Convertible|| 151 953 021 A
151 953 021 B