Hey Joe,
That there is a reproduction patent 1858 mason jar.They were made in the seventies.
They came in a few different colors,and are identifiable by the 971 mold #,and the three mold seams.I have a pint cobalt one. Anthony
Thanks for the reply. I am having trouble with the color thing. I have more of these jars that are easily aqua but this one just looks different, like a powder blue or sky blue. Is that the case or is it just another shade of aqua? Also it is missing the th on the end of 30th. is that common? Joe