"Too many revisions" git message

On git version 1.7.9.5, when trying

git stash show -p stash@{"Friday Smarch 13 13:13:13 2013"}

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I get the error message

Too many revisions specified: stash@{Friday Smarch 13 13:13:13 2013}

I also get the same error message when trying the following

git stash show "stash@{Friday Smarch 13 13:13:13 2013}"
git stash show -p stash@{Friday\ Smarch\ 13\ 13:13:13\ 2013}

I don't think escaping is the cause. If I do

git stash show -p stash@{Friday\ Smarch\ 13\ 13:13:13 2013}

Then I get a different error message:

fatal: ambiguous argument 'stash@{Friday Smarch 13 13:13:13': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions

By contrast, doing

git stash show -p stash@{42}

Works.

What does the error message mean, and what should I do?

This does not answer the OP's specific situation but I don't have enough reputation to add this as a comment... This page is one of the top search results for the error message `Too many revisions specified`

If you are using Posh Git or some other powershell command line then you get the above error message when you enter a command like

git stash show -p stash@{2}

Powershell doesn't like the curly braces.

git stash show -p stash@'{'2'}'

should do the trick.

Similarly:

git stash show -p "stash@{2}"

also avoids the error.