For the file :

531_plaingauge_throughout_70-73.jpg

Plain gauge-throughout frames were almost never made because most of
the ride quality comes from the butting in the main triangle and the
forks and the weight savings from plain-guage tubing was almost nothing.

My plain gauge decal images have the bottom row of writing
painted-over in black by the Carlton Factory.  Carlton probably had
some spare decals laying around, and installed them and painted over
the words, "Forks, and Stays" with a paint brush.  They also did this
with 531-throughout decals.

An image of the plain-gauge throughout decal also appears in Eugene
Sloan's 1st edition "Complete Book of Bicycling".

- Don Gillies
San Diego, CA, USA