Chinese(?) Brass Slide Rule; unknown purpose

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Country of manufacture: ___________-,            Date of manufacture: ____
Overall length: 28.1 cm,          Width: 3.4 cm,           Weight: approx. 1 lb 4 oz.
Materials: brass, closed form simplex design.
Cursor: 2.9 X 3.3 X 0.6 cms; brass runners holding glass lens; lines = one line
Scales: 9, specialized?
Front:
Slide Back:
Back: Blank
Condition: C3 (Signs of very minimal use)
Came with: Brown leather heavy sewn case

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Bottom Edge:

Slide Back:

Expanded views of symbols on left,            Expanded view of right
and right ends of front of rule:                         end of slide back:
                                 

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