My uncle gave this to me, tractor, car engine related??

[Helix]

Looks like a small grease hub cap of a early 1900s paper wagon. No id marks of any kind...

 

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[HuntinDog]

It's a hot water pot whistler top.

 

[villagenut]

Great ID dog

 

[kcm]

I'm sure some of us recognized that right off. But I'll be danged if HuntinDog didn't even find the correct picture. WOW!! My hats off to both of you!

 

[G.I.B.]

ahhhh yes, the whistling bluebird of hot water-

Brings back memories.

Please don't call it vintage.

We (the vintage hunters on this site) will not go quietly...

 

[Helix]

It's a hot water pot whistler top.

My hat is off.. Thanks.

 

[rreahard]

It's a hot water pot whistler top.

Fantastic ID!