I am trying to estimate the approximate date my 1916 car was assembled. Did Ford work a 5 or 6 day workweek in 1916.
My T : 1916 Touring 1,253,721
May 1, 1926 started the 5 day week for factory workers only.
Motor number 1,235,721 corresponds to May 19, 1916 according to Bruce McCalley's black book.
Determining when the car itself rolled off the assembly line is a different matter. It also depends at which branch the car was assembled.
An individual's work week is not relevant. For example, the Detroit factory was typically open seven days a week. For example, on May 30, 1916 the factory was closed. Also, no motor numbers correspond to May 14.
May 14, 1916 was a Sunday (also Mother's day), and May 30 was a Tuesday (Decoration day).
I estimated May 20th - May 19th it is.
If the factory ever operated seven days a week the serial number records don't show it. During the peak production years no numbers are shown for Sundays. Later production numbers are shown only for Monday through Friday.
Somewhere, I found a list of serial numbers and the day they were assembled into automobiles. It gave the number for the beginning serial number for a assembly day. For example, my 1916 touring has engine number 1,309,287, casting date 17 June, 1916. It happened to also be the first car assembled on 20 June 1916. If I could only remember where that second date came from!
Thanks for pointing that out.
I was looking at the days of the month so fast in the black book I didn't notice.
Now that I look again, I see it.
For May 1916, no serial numbers on the 7th, 14th, 21st, 28th, all Sundays. Also closed on the 30th.