Information and pictures of the Walter B Bowie Pie Co. seem surprisingly elusive. The 1932 CD has an address of 1119 W 25th for W B Bowie, wholesale bakers. The 1936 CD lists 19 salesmen and a baker working for Walter B Bowie, which now has "(pastry)" after its listing under "Bakers - Wholesale". By then they had moved to the 4607 S. Main address posted earlier by
GW.
A factory type building appears on the S. Main Street site in the 1948 image on Historic Aerials, and remains there (with variations) until the last I could find, which is a 1994 image on Google Earth (below).

Google Earth
The site is now occupied by the Junipero Serra Library.

Google Earth
I also managed to find a Bowie pie dish on
etsy.com. Their description says:
"Vintage 9" (22.9 cm) aluminum pie pan, with "Bowie" stamped on the bottom. Bowie Pie Company was located in California in the 1940s and 1950s. A deposit would be added to the cost of the pie when purchased and refunded when the pan was returned--hence the inscribed company name.
There are four holes in the bottom, which let the steam escape when baking to create a crisper crust."
etsystatic.com
I case it helps, one of
e_r's pictures has a De Soto/Plymouth dealer in the background. There's a list of De Soto dealers
here (PDF file).