I would say with some authority that the 1919 date is way off.  My 1910
Weber upright has a serial number of 66507, making this one extremely
early.  I see nothing to suggest it is of foreign manufacture; note
"New York" on the fallboard.

It seems to be built the way one would expect an instrument this early
to be built: control levers behind the fallboard, natural wood finish
throughout the top action, and so on.  You will probably find that the
stack is double-valve with only 65 notes, the tracker bar replaced with
an 88-note one and automatic sustaining pedal device either absent or
added later.  Also, Weber was using a full iron plate in their uprights
by as early as 1914.

My 1910 Weber has 4 levers for expression: Sustaining pedal, Hammer
rail, Soft bass and Soft treble.

The Soft bass and Treble levers must be engaged and Themodist or
"ACCENT" switch 'on' in order for the snakebites to have any effect.
As with the foot-impelled Duo-Art, Theme intensity is determined by
the amount of foot pressure on the pedals.  However, Accompaniment
level is either fixed or determined by the position of the reservoir.
Perhaps the missing parts comprised a mechanical linkage between the
accompaniment regulator and reservoir.

Jeffrey R. Wood