||There is no manufacturing date on
this slide rule, but printed on one of the side is the character "S". I
do not know what it means.
Not visible on
the photographs is a logarithmic scale on the bottom.
The addiator on the back is different from my
other addiator slide rules. Normally there is a handle on the top that
you pull to zero all positions. On this rule, the handle is recessed and
has to be moved with the stylus.