any info on this mason jar ?

[mikmis]

just got this from my kids for my b-day .can anyone tell me when and where it was made .i think it has a ground lip and a #47 on the base.

 

[mikmis]

heres the lip .

 

[sweetrelease]

that there is what they call a "keystone" mason. the symbol in the middle is a keystone. the jar looks like it has a ground lip,if it does the jar was made around 1880 - 1910 give or take a few years. these jars sell for around $10.00 to $20.00 but if it was say, amber it would be big $$$$$ .~matt

 

[mikmis]

cool !! thanks for the info matt