Adding another couple data points if there is any interest in this:
1. Date Shipped on the PHS 11-02-72 (Thursday)
Time Built code on Data Plate 10C
Schedule Date on Data Plate 703214 (this one is odd because I thought the 3rd digit would always be a "0".
2. Date Shipped on the PHS 01-30-73 (Tuesday)
Time Built code on Data Plate 01D
Schedule Date on Data Plate 620419
3. Date Shipped on the PHS 04-06-73 (Friday)
Time Built code on Data Plate 03E
Schedule Date on Data Plate 130829
The Schedule Date coding on the Data Plate can be found on the '73 Build Sheet. I have only two such examples to review.
The code is typed in the format of XX-XXXX such that for the 3rd listing above it would have been typed to read 13-0829 while it was embossed without the dash (and without any space) on the Data Plate as 130829.
Below the code on the Build Sheet is the corresponding calendar date.
From the Build Sheet examples;
Schedule Date code 68 corresponds to 02-05 (Monday, Feb 5th)
Schedule Date code 61 corresponds to 06-11 (Monday, June 11th)
I don't have Data Plate or PHS records to go along with either of the Build Sheet records so I do not know whether the date on the Build Sheet matches to the Date Shipped on the PHS or would precede it.
If I use the 2nd listing above and consider Day 62 as Jan 30th, then Day 68 would be Feb 5th if I count Sat. and Sun.
If I skip Sat. and Sun. and make day 62 Friday Jan 26th, then Day 68 is Monday Feb 5th.
If I continue to skip Sat. and Sun., I make Day 99 Tuesday Mar 20.
Then I make Wednesday Mar 21 as Day 01 and continue, still skipping Sat. and Sun.
I then make Day 13 as Friday April 6th. For the 3rd listing above, the Date Shipped is April 6th while the Schedule Date code is 13. Believing the Schedule Date code was a day or 2 in advance of the Date Shipped, I'm guessing that a couple Saturdays were actually production days.
Continuing from there, I make it to June 11 as Day 59 whereas the Build Sheet makes it Day 61.
I suspect that Memorial Day was a holiday, so I suspect there may have been 3 or 4 Saturdays as Production Days between April 6th and June 11th.
It would take some more Build Sheets and additional Data Plate codes and PHS records showing the Date Shipped to refine the "match" between the Schedule Date coding and the Calendar.
But I suspect the above is pretty close.
If Day 62 is Jan 26th, counting backwards and skipping Sat and Sun, I make Day 48 as Monday Jan 8th.
The 1st listing Schedule Date coding is an anomaly. Don't know if the coding changed from early year or if the guy embossing that particular Data Plate simply screwed it up.
More early records might decide one way or the other. Based on what you guys are saying about the start of '73 production, a 10C build figures to be very early, so perhaps the coding style had not yet been established and the 703214 would be interpreted differently?
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