English translation: issued for all legal intents and purposes.
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Explanation: Attitudes differ as to how this should be translated (or not at all!), but I replace it by the "To whom ..." header (possibly in replacement of another title such as "Attestation" or something equally useless) which fulfils exactly the same purpose.
xxxBourth Local time: 09:02 Native speaker of: English PRO pts in pair: 18679
16 mins confidence:
to serve and avail when and where required
Explanation: On a déjà posé cette question plusieur fois (voir KudoZ Glossaries). Ceci est ma solution préférée (merci Nikki).