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Is it brass?
It reminds me of the old filler caps on those old pump up kero or petrol lamps. But why have the knobby bits on the outside?

Maybe its not a cap but a spray head or nozzle?
 
The last couple of pics look like the top of an Amal motorcycle float bowl, but they are usually marked Amal.
A fair bit of speculation on this one, but I reckon @eldertofu is on the money here. I managed to coax out the two protruding bits and one is/was a primer push pin to lower the float to add fuel to the carby bowl...... early 1900’s motorcycle.
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So depressing the brass pin pushed the float down temporarily increasing the fuel level in the float chamber.

Why / when would you want to do that?
 
As an an old motorcyclist I can say that the purpose of depressing the plunger was to "tickle the carb" ie add a bit of fuel to produce a rich mixture to assist with starting. My 1949 Vincent Rapide (1000cc V twin) had a pair of them and you needed any help you could get to kick start it.
 

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Didn’t early Holdens or cars of that vintage have carburetors that had a bleeder valve as well. From memory maybe it was on the underside to let fuel out of the carby when flooded? I’m not a rev head and testing my memory here.
 
As an an old motorcyclist I can say that the purpose of depressing the plunger was to "tickle the carb" ie add a bit of fuel to produce a rich mixture to assist with starting. My 1949 Vincent Rapide (1000cc V twin) had a pair of them and you needed any help you could get to kick start it.
That’s right eldertofu.... it’s definitely a “tickler”or “jiggler” to do just as you describe, to add some fuel when cold starting.
 
As an an old motorcyclist I can say that the purpose of depressing the plunger was to "tickle the carb" ie add a bit of fuel to produce a rich mixture to assist with starting. My 1949 Vincent Rapide (1000cc V twin) had a pair of them and you needed any help you could get to kick start it.
Thanks - I learned something new!
 

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