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Revised
   $^\color{red}\wedge$   Proposal to consolidate and under the more-aptly named and to redescribe in order to avert my suggesting a new tag.

These two tags now mostly overlap, and doesn't naturally imply well-known.
  $^\color{red}\wedge$

Current description of $~\rlap{\,\raise-12mu{_\color{red}\wedge}}$ (would be moved to , which has no description yet):

A tag used to specify a real-world puzzle, that is well known, and usually unsolved.
This tag is most generally used when posting a real-world puzzle/mystery. It is almost always an unsolved mystery, and there is usually a very low expectation of the community actually finding an answer.

The main line could be changed to something like: A real-world puzzle that is well known for being or having been unsolved.
$^\color{red}\wedge$
Now uniquely under :

$\kern19em$ (keep in as it is not well known)
Computations of an old woman       (unsolved)   $^\color{red}\wedge$
A good puzzle is a double-edged sword   (solved?!)

Now uniquely under (see also Posting famous unsolved puzzles):

The 2 million, er, 20 dollar problem

Now under both:

The Beale Papers
Unsolved Mysteries: Kryptos
Unsolved Mysteries: D'Agapeyeff cipher
Unsolved Mysteries: Magic Square of Squares

Proposed (re)description of or of yet another new tag, perhaps :

A real-world puzzle from practical experience.
This tag is for puzzles that have actually been encountered and solved $\llap{\color{red}{ \raise8mu\underline{\phantom{\small and~solved}}} \, }$ in the course of coincidental activity.

Computations of an old woman
  $^\color{red}\wedge$
Euclid's orchard
Halve time with two timers
Odd hours with two timers
Day and night of the two timers
(others under the radar)

Interesting puzzles that arise in the wild have consequential solutions. A broad understanding of puzzles includes this aspect. An enhanced sensitivity toward this could bring us unusual examples beyond imagination alone.

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  • $\begingroup$ The description of real-world practical puzzles can be improved, of course. Already not so enthusiastic about the term coincidental $\endgroup$ – humn Apr 10 '16 at 19:54
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    $\begingroup$ I think the description for real should be used for unsolved-mysteries instead, but the "computations of an old woman" question should not be retagged because it is not a well-known mystery. $\endgroup$ – f'' Apr 11 '16 at 2:14
  • $\begingroup$ Revised slightly, hopefully in a way that reflects @f'' 's comment $\endgroup$ – humn Apr 11 '16 at 9:38
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The tag was revised a month and a half ago as shown and was given a description around the same time. Hurray!

I'll check for comments here before adding to the puzzles suggested in the question, along with one or two others that have surfaced, in a day or two.

Summary:

A tag used to specify a real -world puzzle, that is well known, and usually unsolved which usually do not have a solution at the time of posting. This can include widely-known puzzles that have remained unsolved for some time.

Description:

This tag is most generally used when posting a real-world puzzle/mystery, and as such, the ability of the poster to provide additional details may be limited. It is almost always an can represent a widely-known unsolved mystery, and for which there is usually a very often a low expectation of the community actually finding an answer.

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