Richard Vance said, "By the 1920s Duo-Art had gone to the standard
box pump, just like Ampico."

For your info, I have two 1924 Steck Duo-Arts, one grand and the
other is upright.  The upright has a steamboat pump and the grand
has the usual rotary pump.

Gary Rasmussen
GaryRasmussen@aol.com