Hello!
Having trouble valuating this mason jar as it doesn’t perfectly fit any price guides in regards to its markings and size.
Judging by the variation of the logo its 1910 – 1923 I believe.
Its capacity is half gallon (1800ml)
What has me a bit puzzled is i’ve only seen these with an additional marking which would usually fall between the “Ball” and “MASON”
http://www.wikihow.com/Date-Old-Ball-Mason-Jars
By “additional markings” do you mean the words “perfect” or “improved” !! There were many variations used in the 2 quart Ball jar !! The link above has a pretty comprehensive list of Ball Jar logo`s !! You will still find many that do not fit the exact list !! You are correct that your jar is the “dropped a, 2- L Ball jar” from 1910 to 1923 !! Search for that logo and you will find many !!
One of the many sites I obviously visited prior to my last resort (posting here)!!!!!