You wouldn't happen to be in the bay area would you? I looked closely at your pics and swear I dug up some of the exact same stuff! Looks like you got down about 3-4 feet. . . You'll notice the changes as you dig deeper through layers & layers & layers. . . so much fun awaits you!
I don't like to dig alone so hoping to find some local diggin buddies~ I'd want to you to tell me a good digging story before we meet up though! I'm in SF but I have a car.
I always seem to end up in this forum while doing research and finally registered!
I love little & mini bottles especially if they are blue and have an ebay alert set to email me whenever new ones are listed[;)]. I recently noticed that one seller in particular was selling a mini cobalt...
I realize this is an old thread but it appeared on the first page results of a google search I did for "vintage french's mustard jar" so I wanted to include my information. . .
So I have a very similar jar to yours with raised lettering "IT'S FRENCH'S" & on the bottom " DESIGN PAT'D FEB...