What is this

[necn24]

Anyone know what this is thanks! It says on the bottom “No 55” about the size of a quarter

 

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[Kray Gelder]

Reminds me of a seal from a can of brake fluid or lantern fuel. Had to punch it and pry it off.

 

[Doubter in MD]

It is the lid off of the 55th of the 57 Heinz varieties...

 

[A2coins]

Lol great I'd if that's what it is

 

[HuntinDog]

Cap form a fuse or possibly a freeze plug

 

[necn24]

Thank you

 

[Kray Gelder]

Cap form a fuse or possibly a freeze plug

On further thought, I think HuntinDog is right. A freeze plug.