I have an Antique Nautical Instrument (Sextant), which is of Pre-British Era (1753-London), and it's Non-Functional Instrument.

It is non functional because it need a scientist to set mirrors orientation to get the Functions like;
1. Beyond-Wall Test,
2. Below-Earth Test,
3. Under-Sea Test &
4. All Nautical Tests.

If anybody interested, please do WhatsApp only to me, I will send you the Pics and Video Clip of the Article.
WhatsApp: (Eight Four Tripple Nine Five Eight Seven Two Eight)
With regards,
SSK