The picture to the lower right is a close-up of finish of the Mission bottle.
It shows that the side mold seam does go up to and through the finish/lip all the way to the top of the bottle.
The makers mark cinches the date in the 1940s of course, but without this marking the bottle date could not be refined further.
This site contains very limited information on specific companies that utilized bottles; such information is impossibly beyond the scope of this (or any) site (or book).
covers Applied Color Labels (ACL) which this bottle does have.
A close-up of this bottle's ACL is actually shown under Question #13 on the Dating page.
Once the likely bottle age or date range is determined, some examples of other places to look for more information is provided.: -It is about 9" (23 cm) in height and 2 3/8th inches (6 cm) in diameter.
-It is made of thick, heavy glass for its size, weighing almost 1 lb.
(Note: The "I" can appear as a dot in the middle of this mark like with this bottle, though on most it is a more or less distinctive "I".)Reading down through the narrative in Question #11, we find out that the number just to the right of the Diamond-O-I mark is the last two digits of the year the bottle was manufactured, which on this bottle is a "46".
-There are molded (embossed) "swirls" on the shoulder and upper body of the bottle.
-The glass is clear (colorless) with just the slightest "straw" tint when looking through the thick portion of the base.
) to the specific dating questions on the Bottle Dating page are included so that a user can reference the necessary portions of that page.
Each of the green question hyperlinks result in a pop-up page showing the particular question on the Dating Page; once read it should be deleted to avoid clutter.