Question 1

How does the seller get around using a reputable brand on such an obvious fake product?

Accepted Answer

Some foreign countries and corporations do not honor or abide by U.S. laws and patients.  Actual Tamaya sextants are precision instrument which require a lot of skilled labor, high quality materials to produce, careful adjustment and they are priced accordingly.  If you see a new instrument which bears the brand name at a huge discount, you should assume it is a knockoff and  probably not be calibrated or even usable for navigational purposes.  If the patent has expired on a particular item or feature it may be legal, if not ethical, to produce and name a knockoff by a brand name which is no longer protected by a U.S. or other patents.  Tamaya is only one of many brand names associated with navigational instruments, which is being used to sell really bad knockoffs on various retail venues.  In some cases the knockoffs are actually usable with suitable adjustment by an expert, but they will never be the same quality as real C. Plath, Cassin's and Plath, Tamaya or other original,  name brand instrument.  In most cases these knockoffs cannot be adequately calibrated for navigational purposes...they are fine for the coffee table or knickknack shelf, and kind of, sort of, work, but are not reliable, no matter how shiny and cool they might look.  
The answer to your question: they do it because they can.  If there is no statement of purpose or a statement of correction card included, you should assume it is a knockoff and fit only for display, not use at sea.  Your best defense is to educate yourself about sextants and navigation and have enough knowledge to see through the advertising hype that usually accompanies the various knockoffs.  When the advertising says "fully working" that does not mean calibrated or usable at sea, that usually means that the arm swings and it has a scale, an arm lock and adjustment knob of some sort.  I know of only one or two types of usable sextant which cost less than a thousand US dollars a copy: one is a rather fine sextant produced in China under the brand name "Astra" and the Davis line of plastic sextants.  If you are looking for a usable instrument you might want to look at these or buy a good used instrument from a reliable dealer.

Question 2

How is the accuracy?

Accepted Answer

You can calibrate before use

Question 3

Is this something you could trust your life with during open sea navigation? Or is it better for decoration or novelty use?

Accepted Answer

I purchased it as a decoration but I was told it is the same model that has been used by a sailing school in Maine to teach their students in their hands on at sea classroom.

Question 4

is there a case?

Accepted Answer

Niet

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