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I've never seen this sextant before but I looked over the eBay auction
and decided it has one big problem: filters.  As best I can tell there's
no way to use one level of filtering for the index mirror and another
for the horizon.  Things like a bubble horizon are out (unless one's
built in?) as are astigmatizers and varying scope powers.  Of course,
all off that could be built in.  But I'm not holding my breath on any of
that being present.  Good luck with your bidding!  :-)

Rick Emerson
S/V One With The Wind

Greg Rudzinski wrote:
>      Has anyone on the list used an Obervator Mark 4 sextant (Dutch
> made) and how does it compare to other sextants ? There is one listed
> on Ebay right now.
>
> Greg
>

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