http://en.wikipedia.org/wiki/Manu_propria

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Note added at 6 mins (2014-03-13 11:39:20 GMT)
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The EU correctors will often delete this (i.e. leave it blank).

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Note added at 10 hrs (2014-03-13 21:35:17 GMT)
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1. As to “signed”
I suppose the highly pedantic answer would be that, while accepting the elliptical construction of “vlastní rukou” in this case, it does not mean “signed”, i.e. you can obviously have a letter, a will, a CV, etc., “(na)psán vlastní rukou” (but not necessarily signed…). The same applies to “manu propria”, so it appears to be a fitting equivalent.

2. “v.r.” in legislation
In English law, the equivalent of “Zeman v. r.” is (in jest) “Be it enacted by the Queen's (King's) most Excellent Majesty…” (!)
http://www.legislation.gov.uk/

3. “v.r.” in judgments
In published judgments (English law), the judges’ names (not signatures) are listed at the start of the document, but do not feature at the end, so perhaps we cannot find an equivalent here (I stand to be corrected).
http://supremecourt.uk/decided-cases/index.shtml
http://www.judiciary.gov.uk/media/judgments/2014
For a bit of diversity (Victoria, Australia):
http://www.magistratescourt.vic.gov.au/jurisdictions/judgmen...

4. Solution
As Gerry mentions, in the ideal world, it would probably be best just to ignore “v.r.”, but otherwise I'd use “m.p.” and let the client (or proofreader) do what they want with it. That said, if you want to use "signed by... [in his/her own hand]" as a more elegant solution, I don't think too many people are going to be upset.