Think I may have stumbled across a hint to the origin of your jar. I know I have seen some over the years, usually used as a coin collecting bottle. Check out this description of a stained glass panel which uses the base of one of these jars for it's centerpiece.http://www.dmstainedglass.com/gallery/artpanel/piggy.htm
"This Little Piggy Went to Market
The central piece of the Piggy window was harvested from the bottom of a giant pigs knuckles jar
. The words This little piggy went to market are embossed around the pig."
Sorry no luck yet with a maker or date.