Here is a more definitive answer from
http://www.g503.com/forums/viewtopic.ph ... 802#711802TM 10-1563 2½ ton 6x6 models CCKW 352 &353 published august 17, 1942:
Serial and operating data plate reads:
Summer -S.A.E. 20
Winter -20W or 10W
TM 10-1269 2½ ton 6x6 models CCKW 352 &353 published january 19, 1942
Serial and operating data plate reads:
Summer -S.A.E. 20
Winter -20W or 10W
This plate offered on ebay belongs to a EARLY closed cab truck, so no 1943 open cab blah blah blah!
Only thing wrong with the set of plates offered is that they are not a matching set. Publications and warning for driving thru wires must be left away for closed cabs. For open cabs the operating data plate is to early!