I have two early spark levers here the bent type the grey one is a lot heavier than the black one is one earlier or just a change in casting, Bob
Bob, the different 'types' you show may just be variations on the same part supplied by different manufacturers. You may find differences in the forging marks. I believe they are forgings, as they can be bent/re-bent into shape.
At least, that is what I have found in Australia.
Allan from down under.
Thank you I know the early brass car levers were bent, did not know if one is earlier than the other, Bob