Andyr,
I'm curious how you know it's from St. Louis? And apart from the engine production date, is the body number correspondingly low? Once vehicle production started up at assembly plants other than Dearborn in May, 1932, the correlation between V-8 engine numbers and vehicle production timing started to deteriorate, but it was still generally pretty good all things considered. Because of the huge numbers of fours built prior to their use in vehicles, that correlation is a mess.
And a Merry Christmas to you and yours.