Typical example of Hemmi model 6.
The specimen shown below is wood; only the sliding surfaces are bamboo.
The edges are bare wood. It is owned by Wataru Tsuchihira who
thinks it was part of a short-lived experiment in producing a less expensive
slide rule. The specimen is slightly warped.
Here is a picture of the end of the wooden model 6 perched on top of an
all-bamboo model 8: