Looks like 1950 was a time when they had some labor issues? Or maybe the recordings were done after work at the corner Pub? Looking at the mess I'd have to say your bike is actually a 1950 model but it was stamped and never recorded due to a head banging hang over.
08/31 ------------------ G285944 --------------- G288335 .........2391 serial numbers stamped
09/01 ------------------ G288336 --------------- G289468 ........1132 numbers stamped
09/02 ------------------ G289469 --------------- G291019 ........1550 numbers stamped
09/05 ------------------ G291020 --------------- G293357 ........2337 numbers stamped
09/06 ------------------ G293358 --------------- G294890 ........1532 numbers stamped
09/06 ------------------ Z294891 --------------- Z297346 .........2455 numbers stamped the same day so the G's and Z's combined is
3987 numbers stamped on 9/6
09/07 ------------------ Z297347 --------------- Z197714 <------------------- Whoops....... 367 numbers stamped if the #1 digit is supposed to be a 2
09/08 ------------------ Z297715 --------------- Z306173 .........8458 numbers stamped ................WHAT!!!!!! What a Friday that was! Balls to the wall.
09/11 ------------------ Z306174 --------------- Z310129 .........3955 numbers stamped ................Slacking off after the weekend.