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: