BIG Bottle Cap

[up north]

I found this yesterday in an old yard. It was so deep I almost gave up 3 times.
What do you think it is? How old? There is a small mark on the front that says WHITEHEAD-HOAG NEWARK, NJ.

 

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[DigginThePast]

Looks like an advertising ashtray to me.

 

[Silver Searcher]

Looks like an advertising ashtray to me.

And a Green check

SS

 

[Bigcypresshunter]

Looks like an advertising ashtray to me.

...or coaster. My Mom had a bunch of metal coasters that looked like this. Could be used as a shallow ash tray.