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15th February 2002 | 14:18

#5 (permalink)

john_tullamarine

Fleet Manager

Joined: Apr 2001

: ATPL

Posts: 7,448

Likes: 310

From: various places .....

I have no specific knowledge of the particular device .. but might it be just your ordinary old through the roof sextant periscope assembly ? used for taking sun and star shots ...