The serial number is pre-Aug. 1948. To determine if it is pre or post-War, check these site's:
http://www.angelfire.com/rant/allday...sRebuild1.html
http://www.trfindley.com/flschwinn/ (look at the 1946 links -- it shows the post-War changes)
Congrats on the find/save!
Bob Hufford
Springfield, MO