The poster asked about 1931 straight windshield Briggs Fordor production. I'm ASSUMING he means the following.
Quoting from Geo. DeAngelis (p. 163 1971 Edition)
"The new two window Deluxe Sedan, the 170-B.....The straight windshield two window sedan...was phased out in April 1931"
"Production figures show that 12,654 DeLuxe Sedans were built in 1930 and only 740 in 1931"