Congratulations on your purchase, and posting on G503. May there be many more!
Serial number 338873 is a June 1944 Serial number, and the hood regn number will be between 20510000 and 20614000.
All Willys jeeps were assembled in Toledo, Ohio, and your jeep was Contract 5.
There will be some feature specific to your jeep such as,
# the hood will be the GPW type with a Grease Gun Bracket.
# the Body will be a ACM2 type, with the Ford style firewall and Willys style Round toolbox lock indents.
# Type 2 suppression (no under dash filter)
# Rotary Light Switch.
# Reflectors are the Round CB.
There are lots of other things, ask away!
10 X 110S 1
ACM2 Tub 23298
They are "very inflexible and almost radical," he said. "They appeal to a fringe element of gun owners". Gen. Norman Schwarzkopf on the NRA, 1995.