Brian your gun has ejectors, in haste maybe the records were not completely accurate as Japan bombed Hawaii on December 7th. I own serial number 198013 and it was started October 8th 1941 and finished on Febuary 5th 1942, mine is also marked Wildfowl on the barrel lug and was not recorded as such. Mine was also part of order no. 52269. I feel these are quite rare and historical. Congratulations and even better that it has been passed down to you from your grandfather.