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Engineering Compass

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Description

I am not exactly sure what this is.  It is in excellent condition with all caps and box kept with tools included.

I have been told it is an Engineering Compass from the 1940's.  Looking for more information and approximate value for sale. 

Category Scientific Instruments
Medium Brass
Distinguishing marks Serial 28559, 78308
Condition Excellent
Size and dimensions of this item 11" tall
Weight 16 Pounds
History I inherited this from a family member that was in construction in the 40s-70s. I have been told this is an Engineering Compass. When I looked into Tamaya I saw Sextant, but not sure what this is. It has been kept in the box at all times.
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