As Ian said, 12-19 is the build date, not a reweigh date.  There was no regular  reweigh requirement for tank cars at this time, and they often sported the build date for many years.

And yes, those are (unsurprisingly) KD brakes.  I have looked at quite a few builders photos of AC&F tank cars, and every one with a build date of 1916 or earlier had KC brakes. 1917 and 1918 seem to represent a transition, with about an equal mix of KC and KD.  Every car built in 1919 or 1920 had KD brakes.  1921 and 1922 are "undersampled", but the limited evidence suggests KDs were still applied.  1923 seems to represent a rapid switch back to (mostly) KC.  From 1924 until the advent of AB brakes in 1933, all AC&F cars had KC brakes.

As for the tank and dome configuration, I would remind everyone of Ed Kaminski's caution that Type 21 (or Type 11, 27, etc.) referred to AC&F's frame design.  The tanks could vary depending on who placed the order.  The LL/P2000 models reflect the most common dome sizes, but they are not always correct.  Texaco cars, as an example, had oversized domes not accurately captured by the models offered in Texaco livery.

Dave Parker

Riverside, CA