Not what is it but how old?

[Beeps in my sleep]

Metal Detecting a good friends field today that has produced many good things including my 1840 seated liberty. Today I zeroed in on this signal. Found what was left of the metal ring. The metal I threw away because it was corroded and falling apart. However this glass remnant was left. I know its for a Mason jar as it states but any idea when these things were around? I have found these before but not in this good of shape....And before you ask.. I double checked my hole to make sure that was all that was in there and it was

 

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[jeff of pa]

It is virtually impossible to assign a specific age to any of these lids. Presumably, the first ones date from approximately 1869. The very earliest versions are said to have been made in transparent glass, with milkglass versions introduced approximately 1871. It is assumed the most of the earlier versions of these liners have the name “BOYD’S” or “BOYD” embossed on them. Later versions may or may not have the name included in the lettering.

Lewis R. Boyd was issued a patent for Porcelain Liners on March 30, 1869.
But they were used into the 50's at least.

FYI Only a very few of them were actually made of true porcelain, the great majority being made of glass.

Boyd's Genuine Porcelain Lined Cap - GLASS BOTTLE MARKS

 

[jeff of pa]

here is an
[h=2]Unofficial Study[/h]Looks informative if you have the time to read

Unofficial Ball Lid Study / Now with pictures again in Closures Forum

 

[Beeps in my sleep]

Thank you Jeff! Once again you come to my rescue! I need to get up your way sometime when I am back in the Selinsgrove/Nory area!

 

[taz42o]

The H A mark in the center is for Hazel Atlas glass company 1902- 1964.

Hazel Atlas Glass Company