There is always so much more to learn. Currently I do not have enough of the puzzle pieces to have an answer. But I welcome additional clues.
From:
http://www.mtfca.com/discus/messages/29/31535.html back in 2005 Leon Parker was restoring a 1927 coupe with a number stamped on the front floor board sill (in front of the seat riser). That number was 025693B
Ken Lefeber would you please confirm you are talking about the 1927 Coupe listed in your profile or correct us if appropriate?
Ken has a 1927 (probably a coupe) with the number 148702B stamped in I believe the same general area that Leon's number was found.
For the 1926-27 style coupe bodies Ford was producing their own bodies. (That doesn't mean he could not have purchased some from an outside supplier. I have not heard of Ford doing that for the 1926-27 coupe bodies. But for one year of the 1928-31 Model A Fords, Henry did purchase a few coupe bodies from an outside supplier.) So for a Ford produced body the "B" would not be for a body maker. So I don't think the "B" is for Briggs.
Dave Sturges compiled and published At:
http://www.mafca.com/downloads/Technica ... Number.pdf for the Model A Ford club has a nice listing of Ford Assembly plants and the letter or letters they used to identify the plant. In that listing there is not any plant that used just the letter "B." However, "BO" was used for Buffalo, NY. And if we look at Atlanta, GA in that same list we see that they used the single letter "A" but also used the combination of letters "AA." And a few others used a single letter "H" for Houston; E for Edgewater etc.
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Note they discuss the general (but not always followed) pattern for the letters as:
Note that most of the letter codes are from one to five letters and there is a systematic
way most of the letters were derived from the city location of the assembly plant. When
assembly plant location cities have a single word, the letter code is generally the first and
last letters (i.e. Buffalo - BO, Charlotte - CE, Chester - CR, etc.)
Assembly plant locations having two words generally use the initial letter from each
word (i.e. New Orleans - NO, Oklahoma City - OC, Twin City - TC and so forth).
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So one possible hypothesis (guess) is that during the 1927 (possibly also 1926) the Buffalo plant used the single letter B for their Branch Plant identification.
REPEAT -- THAT IS A GUESS AT THIS TIME
Does anyone else have a 1926-27 coupe with a number followed by a "B" in that area?
Respectfully submitted,
Hap l9l5 cut off