What is this - I need your help!

[wendovertom]

OK - this is a donated item with absolutely no info with it. I am thinking it is a gunsight of some type but I am asking for a bit of help here!

view one

By taakox at 2012-01-02

view two

By taakox at 2012-01-02

bottom view

By taakox at 2012-01-02

there is no id tag but there is a plate screwed on that says "nullius in verba" or "take nobodys word for it"

Thank you!!

Tom P.

[Forgotten Field]

AN 5851 Bubble Sextant. AAF and USN use in WWII

http://cgi.ebay.com/WW2-US-Navy-Bubble- ... 500wt_1100

They were hard to use, hence the Latin- Funny!