I restored a Seeburg L in 2009 and my piano technician, who was
re-stringing it, wanted to tune it to A=440, so I posed the question
to Art Reblitz.  He confirmed that virtually all orchestrions, apart
from Nelson-Wiggen, stuck with A=435 till they ceased production in
1929.  So your xylophone is right -- tune the _piano_ to A=435.

John Farmer, UK