Your pipe fits this perfectly except the lack of hardware (pipephil.eu):
“(Left side) Super Grain (Over...)Kaywoodie
(Right side) Imported Briar, 5131C
▲ This pipe is stamped with a four digit number which situates its production year between 1931 and 1938. Because of the introduction of the "Imported Briar" stamping in 1935, the pipe could have been manufactured between 1935 and 1938”