Weird glass thing

[SaskTreasurehunter]

I found this little glass thing in a box of old bottles at a sale.

 

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[Unicorn]

From the angle of the picture it looks like a glass lid for something.

 

[ticm]

I find them from time to time. I am pretty sure it's a lid.

 

[Deputy Dave]

Some type of canning jar lid.