Again we have the three pieces with extended arms, having 2 notches on each side. The left unit is marked UNIVERSAL in a horizontal recessed area, with the NO / 1003 shown below, again in a recessed area. The centre unit is similarily marked, but is covered somewhat with glaze. The right hand piece has the PATENTED / APRIL 12 1910, same as the UNIVERSAL pieces, but this is the unit with the vertically recessed unit on the reverse side. [see last photo]

If anyone has any information about pieces with this vertical marking, I'd appreciate hearing from you.

Confirmed as UNIVERSAL