Small glass lids?

[fe2o3]

Found these glass things at the site of an old amusement park. They're 1 5/8" in diameter. On the inside it says: PAT. APRIL 10 (or 01) 1900. Any ideas as to what they are?
Thanks,

fe2o3

 

[traderoftreasures]

Probably to a bail top milk jug.

 

[IronSpike]

Probably to a bail top milk jug.

I think that's it

Here's one slightly different but with same date reference:

http://www.antiquesnavigator.com/old-milk-glass-price-guide/antique-milk-glass-price-guide-66.html

Added: traderoftreasures got it Here's a good link and notice the reference at the bottom:LYON JAR PAT APR 10 1900

http://dairyantiques.com/Bail_Top_Milk_Bottles.html

 

[Breezie]

Probably to a bail top milk jug.

Yeppers! Nice finds, Breezie