Bill asked:
> 
> can anyone elaborate on their experiences with, and knowledge of, said
> plane?  the archival information is scant.
>
    PTAMPIA2 says that they were made in three sizes (block - OH20,
smooth - OH4, and jack - OH5).  They were first made in 1939 as a
limited offer for the National Hardware Open House of 1940, and
discontinued on May 13, 1941.  They were brought back to life in 1949
to  be offered for the National Hardware Open House of 1950, and
permanantly retired in October of 1951.  The earlier ones are marked
"Stanley Two Tone - Made in USA" on the cutter.  The later model
sported "Two Tone by Stanley" in script lettering.  Overall, they are
a handyman version of the regular plane.  The broadside included in
PTAMPIA is not clear on the pricing.  The copy reads that the planes
cost $0.75, $3.20, and $3.70.  But a sidebar type listing shows
dealer's costs of 0.40, 1.82, and 2.08, with retails of 0.59, 2.59,
and $2.98

Regards,
Steve - who prefers Odeen's Kollinear explanation of these tools.