i will agree based on the winding wheel screw.
but not sure if the dial was changed to three foot before this change or concurrent.
what is listed as changes....
1903... Double roller escapement (but the serial number associated is the first watch in the first run of movements so how can this be a change )
1905.... pallet arbor piviot and escape pinion change from 14 to 15 (assume this is a larger size)
1911... flat bottom train
1912.... round bottom train
1914.... new winding hubs ( could assume this was the screw # change)
maybe someone can explain Flat and Round Bottom Train?
Sold as movements only until 1911, when offered also as a factory cased example in LOng pendant cases.
16489 to 16490 total production.
1346 in GF
55 movements 'in the grey' for private labels, etc
25 movements 'special finish'... Freer, Luckenbach patterns, but others possible.
last ones to finishing room... 1321001 8/30/1918
grade closed out 1919, not in july 1919 price list.
300 complete 990's shipped to Ball, April 1911, May 1911 samples sent to all "the inspectors"