Using the figures Here:
http://www.ahooga.com/info/product.shtml
http://www.fordgarage.com/pages/ABenginenumbers.htm#C1
If my math is correct an estimate of S/N 4,780,000 - 4,520,832 gives about 259,168 late 31' April-Sept.1931. Of 148,475 Tudors made of 626,575 31's in total that's ~23% of all production and 23% of late 31's is ~61,413 tudors -ballpark
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