Need Help With US 9 Cent Stamp

Hi
This is my first post.
I am looking for help dating a package by it's stamp.
Is this a 9 cent Jefferson and would it have been used in the second half of the 1940's.
Thanks for you help,John

Welcome,
These stamps were issued in 1938 and used for many years (often through the 1950s).
Don

Check out:

http://www.theswedishtiger.com/x1938.html

scroll down to the 9 and 30 cent stamps for more information.

Whatever is in the box is worth way more than the stamps on the box I assure you!

51studebaker summed up all the pertinent stamp dating info of 1938 through the mid-1950s. The presidentials were the workhorse series for a long time. Obviously you know something more from the name of the recipient or the contents to date this box to the last half of the 1940s. Please share the details.

Postally, if we did not have your comment about the box coming from the last half of the 1940s, I would start with the 9 cent stamp which has the extra selvage on the side containing rectangular bars, which indicate an electric eye plate first used in late 1941. Better yet, there is one confirming clue ruling out the early years. The address is "St Louis (20) Missouri", and the "20" is the Zone number implemented in 125 larger cities in May of 1943 - so impossible for your box to be from before mid-1943. I cannot read the wording in the postmark, but that might provide an additional clue if it were a small city station or military station which had a short period of operation. Thus the best dating clues are often in features other than the stamps themselves.

Otherwise there are other non-postal clues such as looking in various city directories, genealogy sources, etc.